const std = @import("std");
const fs = std.fs;
const builtin = @import("builtin");
const common = @import("build_common.zig");
const build_tommath = @import("build_libtommath/build_libtommath.zig").build_libtommath;
const build_zlib = @import("build_zlib/build_zlib.zig").build_zlib;

// ********************
// tclvfs experiments
//const tclvfs_static = @import("build_tclvfs/build_tclvfs_static.zig");
const tclvfs_shared = @import("build_tclvfs/build_tclvfs_shared.zig");
// ********************

//vqtcl/vlerq removed from the suite (old-tclkit experiment; see note near the former
//compile site and TEMP_REFERENCE/metakit + TEMP_REFERENCE/KitCreator for future work)

const build_tclthread = @import("build_tclthread/build_tclthread.zig").build_tclthread;
const build_tk = @import("build_tk/build_tk.zig").build_tk; //G-098
const TkBuild = @import("build_tk/build_tk.zig").TkBuild; //G-103

const tcl_major_version = "9";
const tcl_nodot_version = "90"; //VER in makefile
const tcl_dot_version = "9.0"; //VERSION in makefile
const tcl_patch_suffix = "0";
const tcl_source_folder = "../tcl905";
const tcl_patch_level = tcl_dot_version ++ tcl_patch_suffix; //e.g 9.0b2 - generic/tcl.h TCL_PATCH_LEVEL   (note TCL_PATCH_LEVEL in configure may be different e.g just the suffix "b2")

// e.g result: tclsh90.exe & tclsh90s.exe
const tclsh_shared = "tclsh" ++ tcl_nodot_version; //leave off exe suffix - zig adds .exe automatically for windows
const tclsh_static = "tclsh" ++ tcl_nodot_version ++ "s";

//jmn3
var static_build: bool = true;

//minimum zig version
//const req_zig_version = "0.13.0";
//comptime {
//    const req_zig = std.SemanticVersion.parse(req_zig_version) catch unreachable;
//    if (builtin.zig_version.order(req_zig) == .lt) {
//        @compileError(std.fmt.comptimePrint(
//            "Your Zig version v{} does not meet the minimum build requirement of v{}",
//            .{ builtin.zig_version, req_zig },
//        ));
//    }
//}

comptime {
    //The suite pin (G-102 acceptance: the recipe records the zig version it is
    //written against). The recipe is 0.16-API and does not build under 0.14/0.15;
    //punk-getzig materializes the pinned toolchain (see README Pinned zig).
    const required_zig = "0.16.0";
    const current_zig = builtin.zig_version;
    const min_zig = std.SemanticVersion.parse(required_zig) catch unreachable;
    if (current_zig.order(min_zig) == .lt) {
        const error_message =
            \\This recipe is written against zig {} (see README Pinned zig) and
            \\does not build with older zigs. bin/punk-getzig fetches the pinned
            \\toolchain; https://ziglang.org/download/ hosts releases.
            \\
        ;
        @compileError(std.fmt.comptimePrint(error_message, .{min_zig}));
    }
}
const targets: []const std.Target.Query = &.{
    //.{ .cpu_arch = .aarch64, .os_tag = .macos },
    //.{ .cpu_arch = .aarch64, .os_tag = .linux },

    //.{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .musl },
    // tried this^ - built but:
    // apparently when linking against musl libc for fully static binaries, the dlopen function will only be a stub
    // which stops us loading binary modules.

    //From andrewrk on https://github.com/luvit/luvi/issues/231
    //The other option zig cc provides you is "static except glibc" builds,
    //and if you pick an old enough glibc version (e.g. matching holy-build-box)
    //then your binary tarballs will work on any linux distro that uses glibc and
    //standard dynamic linker path (which is most). This is the $arch-linux-gnu target.

    .{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .gnu },
    .{ .cpu_arch = .x86_64, .os_tag = .windows },
};

pub fn build(b: *std.Build) !void {
    //G-102 invocation modes. This recipe serves two build roots:
    // STAGED mode - build root is the staged recipe copy (_build/<suite>/build) with
    //   the source trees materialized beside it (../tcl905 etc) either by suite.tcl's
    //   fossil flow or by this recipe's own bootstrap staging. Full build graph.
    // BOOTSTRAP mode - build root is the TRACKED suite dir (sources.config present,
    //   no ../tcl905): only the staging steps are registered - 'zig build stage'
    //   materializes the pinned build.zig.zon sources + a recipe copy into the
    //   _build stage, and 'zig build bootstrap' chains the staged build after it.
    //   This is the no-tclsh entry point.
    if (!common.pathExists(b, tcl_source_folder)) {
        if (common.pathExists(b, "sources.config")) {
            try bootstrapMode(b);
            return;
        }
        @panic("suite recipe: no source trees found beside the recipe (" ++ tcl_source_folder ++
            " missing). Use 'zig build stage' (or bootstrap) from the tracked suite dir for the " ++
            "pinned zon flow, or 'tclsh suite.tcl build' for the fossil dev flow.");
    }

    const target = b.standardTargetOptions(.{});

    const optimize = b.standardOptimizeOption(.{});

    //set up and display some of the same prefix-dependent vars as Makefile for maintainability
    const prefix = try std.fmt.allocPrint(b.allocator, "{s}", .{b.install_path});
    const exec_prefix = prefix;
    std.debug.print("prefix {s}\n", .{prefix});
    std.debug.print("exec_prefix {s}\n", .{exec_prefix});
    const bindir = b.pathJoin(&.{ prefix, "bin" });
    std.debug.print("bindir {s}\n", .{bindir});
    const libdir = b.pathJoin(&.{ prefix, "lib" }); //TCL_PACKAGE_PATH ?
    std.debug.print("libdir {s}\n", .{libdir});
    const includedir = b.pathJoin(&.{ prefix, "include" });
    std.debug.print("includedir {s}\n", .{includedir});
    const datarootdir = b.pathJoin(&.{ prefix, "share" });
    std.debug.print("datarootdir {s}\n", .{datarootdir});
    const runstatedir = b.pathJoin(&.{ prefix, "run" });
    std.debug.print("runstatedir {s}\n", .{runstatedir});
    const mandir = b.pathJoin(&.{ prefix, "man" });
    std.debug.print("mandir {s}\n", .{mandir});

    const tcl_library = b.pathJoin(&.{ prefix, "lib", "tcl" ++ tcl_dot_version });
    std.debug.print("tcl_library {s}\n", .{tcl_library});

    const bin_install_dir = bindir;
    std.debug.print("bin_install_dir {s}\n", .{bin_install_dir});

    const lib_install_dir = libdir; //TCL_PACKAGE_PATH ?
    std.debug.print("lib_install_dir {s}\n", .{lib_install_dir});

    const script_install_dir = tcl_library;
    std.debug.print("script_install_dir {s}\n", .{script_install_dir});
    const script_install_dir_rel = b.pathJoin(&.{ "lib", "tcl" ++ tcl_dot_version });

    const module_install_dir = b.pathJoin(&.{ script_install_dir, "..", "tcl" ++ tcl_major_version });
    std.debug.print("module_install_dir {s}\n", .{module_install_dir});
    const module_install_dir_rel = b.pathJoin(&.{ script_install_dir_rel, "..", "tcl" ++ tcl_major_version });

    const include_install_dir = tcl_library;
    std.debug.print("include_install_dir {s}\n", .{include_install_dir});
    //target.result.os.tag = .
    //mac dylib?
    var tcl_shlib_ext: []const u8 = undefined;
    switch (target.result.os.tag) {
        .windows => {
            tcl_shlib_ext = try std.fmt.allocPrint(b.allocator, "{s}", .{".dll"});
        },
        .macos => {
            tcl_shlib_ext = try std.fmt.allocPrint(b.allocator, "{s}", .{".dylib"});
        },
        else => {
            tcl_shlib_ext = try std.fmt.allocPrint(b.allocator, "{s}", .{".so"});
        },
    }

    const tcl_dll_file = try std.fmt.allocPrint(b.allocator, "tcl" ++ tcl_nodot_version ++ "{s}", .{tcl_shlib_ext});
    std.debug.print("tcl_dll_file {s}\n", .{tcl_dll_file});

    //const tcl_lib_file = "libtcl" ++ tcl_nodot_version ++ ".dll.a";
    const tcl_lib_file = try std.fmt.allocPrint(b.allocator, "libtcl" ++ tcl_nodot_version ++ "{s}" ++ ".a", .{tcl_shlib_ext});
    std.debug.print("tcl_lib_file {s}\n", .{tcl_lib_file});

    const tcl_zip_file = "libtcl" ++ tcl_dot_version ++ tcl_patch_suffix ++ ".zip";
    std.debug.print("tcl_zip_file {s}\n", .{tcl_zip_file});
    const tcl_vfs_path = b.pathJoin(&.{ "libtcl.vfs", "tcl_library" });
    std.debug.print("tcl_vfs_path {s}\n", .{tcl_vfs_path});
    const tcl_vfs_root = "libtcl.vfs";
    std.debug.print("tcl_vfs_root {s}\n", .{tcl_vfs_root});

    const tcl_stub_lib_file = "libtclstub.a";
    std.debug.print("tcl_stub_lib_file {s}\n", .{tcl_stub_lib_file});
    //const tcl_stub_lib_file = "libtclstub87.a";

    const dde_dll_file = "tcl9dde14.dll";
    std.debug.print("dde_dll_file {s}\n", .{dde_dll_file});
    const dde_dll_file8 = "tcldde14.dll";
    std.debug.print("dde_dll_file8 {s}\n", .{dde_dll_file8});

    const reg_dll_file = "tcl9registry13.dll";
    std.debug.print("reg_dll_file {s}\n", .{reg_dll_file});
    const reg_dll_file8 = "tclregistry13.dll";
    std.debug.print("reg_dll_file8 {s}\n", .{reg_dll_file8});

    //pass the subdirectory as the build_tcl90/build_libtommath sees it ?

    //const tommath_sourcedir = b.pathJoin(&.{ "..", "tcl" ++ tcl_nodot_version, "libtommath" });
    const tommath_sourcedir = tcl_source_folder ++ "/libtommath";
    //var tommath_sourcedir: []const u8 = undefined;
    //if (target.result.os.tag == .windows) {
    //    //tommath_sourcedir = tcl_source_folder ++ "/libtommath";
    //    tommath_sourcedir = b.pathJoin(&.{ "..", "tcl" ++ tcl_nodot_version, "libtommath" });
    //} else {
    //    //tommath_sourcedir = b.pathJoin(&.{ "..", "libtommath" });
    //    tommath_sourcedir = b.pathJoin(&.{ "..", "tcl" ++ tcl_nodot_version, "libtommath" });
    //}

    //const tommath_lib_compile = try build_tommath(tommath_sourcedir, b, target, optimize);

    const zlib_sourcedir = tcl_source_folder ++ "/compat/zlib";
    //const zlib_sourcedir = "../zlib" ++ "/compat/zlib";

    var zlib_lib_compile: *std.Build.Step.Compile = undefined;
    zlib_lib_compile = try build_zlib(zlib_sourcedir, b, target, optimize);
    //if (target.result.os.tag != .windows) {
    //}

    // ================================================
    //Generated configure-products (G-102): created into the build cache and consumed
    //via overlay include dirs / overlay rc copies. Source trees (staged fossil
    //checkouts or zon-fetched trees) are never written - suite.tcl formerly generated
    //these files into the checkout (and before 2026-07-21 this recipe carried an
    //addUpdateSourceFiles tree-write variant behind the unused 'prepare-source' step).
    //
    //tclUuid.h (tclEvent.c/tclTest.c #include it; upstream configure generates it)
    const wrap_exe = b.addExecutable(.{
        .name = "wrapfiletofile",
        .root_module = b.createModule(.{
            .root_source_file = b.path("tools/wrapfiletofile.zig"),
            .target = b.graph.host,
        }),
    });
    const wrap_run = b.addRunArtifact(wrap_exe);
    wrap_run.addArgs(&.{
        "-prefix",
        "#define TCL_VERSION_UUID \\",
        "-prefixnl",
        "1",
        "-input",
    });
    wrap_run.addFileArg(b.path(tcl_source_folder ++ "/manifest.uuid"));
    wrap_run.addArg("-output");
    const tcluuid_file1 = wrap_run.addOutputFileArg("tclUuid.h");
    //include-dir overlay: using the generator's output dir as an include path also
    //gives each consuming compile its dependency on the generation step. Added FIRST
    //at each consuming module so a stale tree-written tclUuid.h (pre-G-102 flows)
    //can never shadow the generated one.
    const tcluuid_include_dir = tcluuid_file1.dirname();

    //tclsh.exe.manifest (tclsh.rc references it; upstream configure substitutes the
    //.in). Generated at configure time; tclsh.rc is compiled from an overlay COPY
    //in the same generated dir because rc resource references resolve
    //rc-file-relative BEFORE include paths - a stale manifest beside the tree's
    //tclsh.rc would otherwise win over any include-path overlay.
    const tclh_content = common.readSourceFile(b, tcl_source_folder ++ "/generic/tcl.h");
    const tcl_h_version = common.parseDefineString(tclh_content, "TCL_VERSION") orelse @panic("TCL_VERSION not found in tcl.h");
    const tcl_h_patchlevel = common.parseDefineString(tclh_content, "TCL_PATCH_LEVEL") orelse @panic("TCL_PATCH_LEVEL not found in tcl.h");
    const tcl_win_version = common.winResourceVersion(b, tcl_h_version, tcl_h_patchlevel);
    std.debug.print("tcl.h: TCL_PATCH_LEVEL {s} (TCL_WIN_VERSION {s})\n", .{ tcl_h_patchlevel, tcl_win_version });
    const tclsh_manifest_content = common.replaceAll(b, common.replaceAll(b, common.readSourceFile(b, tcl_source_folder ++ "/win/tclsh.exe.manifest.in"), "@TCL_WIN_VERSION@", tcl_win_version), "@MACHINE@", "AMD64");
    const wf_tclshrc = b.addWriteFiles();
    _ = wf_tclshrc.add("tclsh.exe.manifest", tclsh_manifest_content);
    const tclshrc_overlay = wf_tclshrc.addCopyFile(b.path(tcl_source_folder ++ "/win/tclsh.rc"), "tclsh.rc");

    //Runs of the built (non-zip) shell execute the CACHED artifact, which has no
    //../lib/tcl9.0 beside it - point such runs at the source tree's own script
    //library so init.tcl resolves (the zip shell's runs must NOT get this: its
    //attached library is the thing under test).
    const tcl_library_src = common.replaceAll(b, b.pathFromRoot(tcl_source_folder ++ "/library"), "\\", "/");
    // ================================================

    var ac_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer ac_flags.deinit();
    try ac_flags.appendSlice(&.{
        "-pipe",
        "-finput-charset=UTF-8",
        "-DPACKAGE_NAME=\"tcl\"",
        "-DPACKAGE_TARNAME=\"tcl\"",
        "-DPACKAGE_VERSION=\"" ++ tcl_dot_version ++ "\"",
        "-DPACKAGE_STRING=\"tcl " ++ tcl_dot_version ++ "\"",
        "-DPACKAGE_BUGREPORT=\"\"",
        "-DPACKAGE_URL=\"\"",
        "-DTCL_CFGVAL_ENCODING=\"utf-8\"",
        //WARNING - it is not enough to set TCL_COMPILE_DEBUG & TCL_COMPILE_STATS to 0 - if they exist they will affect performance
        //"-DTCL_COMPILE_DEBUG=0",
        //"-DTCL_COMPILE_STATS=0",
        "-DTCL_CFG_DO64BIT=1",
        "-DHAVE_NO_SEH=1", //required for tclWinFCmd.c or we get undeclared identifier '__try'
        //JMN2
        //"-DHAVE_CPUID=1",
        //"-DHAVE_STDLIB_H=1",
        //"-DHAVE_STRING_H=1",
        //"-DHAVE_INTTYPES_H=1",
        //"-DHAVE_STDINT_H=1",
        //"-DHAVE_STRINGS_H=1",
        //"-DHAVE_SYS_STAT_H=1",
        //"-DHAVE_SYS_TYPES_H=1",
        //"-DHAVE_UNISTD_H=1", //probably needs to be 0 if using msvc ?
        //"-DSTDC_HEADERS=1",
        //"-DNDEBUG=1",
        //"-DHAVE_STDBOOL_H=1",
        //"-DHAVE_CAST_TO_UNION=1",
        //"-DHAVE_INTPTR_T=1",
        //"-DHAVE_UINTPTR_T=1",
        //"-DHAVE_INTRIN_H=1",
        "-DMP_64BIT=1",
        "-DHAVE_ZLIB=1",
        "-DZIPFS_BUILD=1", //JMN todo
        "-DTCL_CFG_OPTIMIZED=1",
        "-DTCL_THREADS=1", //probably not required
        try std.fmt.allocPrint(b.allocator, "-DTCL_PACKAGE_PATH=\"{s}\"", .{lib_install_dir}),
    });
    //"-DTCL_NO_DEPRECATED",
    //"-fno-lto",
    //"-DMODULE_SCOPE=extern",
    if (target.result.os.tag == .windows) {
        try ac_flags.appendSlice(&.{
            //"-DTCL_WITH_EXTERNAL_TOMMATH", //required for windows when using tcltommath that *doesn't* come with tcl (?)
            "-DHAVE_STDIO_H=1",
            "-DMODULE_SCOPE=extern",
            "-DHAVE_WSPIAPI_H=1", //windows specific?
        });
        //jjj
        //try ac_flags.appendSlice(&.{
        //    "-DHAVE_STDIO_H=1",
        //    "-DHAVE_STDLIB_H=1",
        //    "-DHAVE_STRING_H=1",
        //    "-DHAVE_INTTYPES_H=1",
        //    "-DHAVE_STDINT_H=1",
        //    "-DHAVE_STRINGS_H=1",
        //    "-DHAVE_SYS_STAT_H=1",
        //    "-DHAVE_SYS_TYPES_H=1",
        //    "-DHAVE_UNISTD_H=1",
        //    "-DHAVE_SYS_TIME_H=1",
        //    //
        //    "-DNO_SYS_WAIT_H=1",
        //    "-DNO_DLFCN_H=1",
        //    "-DHAVE_SYS_PARAM_H=1",
        //    //
        //    "-DHAVE_STDBOOL_H=1",
        //    //
        //});

        //added to try to fix 'linsert {} 0 a b' crash
        //try ac_flags.appendSlice(&.{
        //    "-DSTDC_HEADERS=1",
        //    "-D_REENTRANT=1",
        //    "-D_THREAD_SAFE=1",
        //    "-DHAVE_PTHREAD_ATTR_SETSTACKSIZE=1",
        //    "-DHAVE_DECL_PTHREAD_MUTEX_RECURSIVE=1",
        //    //
        //    "-DMODULE_SCOPE=extern",
        //    "-DHAVE_CAST_TO_UNION=1",
        //    "-DNDEBUG=1",
        //    "-DMP_PREC=4",
        //    "-D_FILE_OFFSET_BITS=64",
        //    "-DHAVE_LSEEK64=1",
        //    "-DHAVEGETCWD=1",
        //    "-DHAVE_MKSTEMP=1",
        //    "-DNO_GETWD=1",
        //    "-DNO_WAIT3=1",
        //    "-DNO_FORK=1",
        //    "-DNO_MKNOD=1",
        //    "-DNO_TCDRAIN=1",
        //    "-DNO_UNAME=1",
        //    "-DNOREALPATH=1",
        //    "-DNEED_FAKE_RFC2553=1",
        //    "-DHAVE_DECL_GETHOSTBYNAME_R=0",
        //    "-DHAVE_DECL_GETHOSTBYADDR_R=0",
        //    "-DNO_FD_SET=1",
        //    //
        //    "-DHAVE_MKTIME=1",
        //    "-DHAVE_TIMEZONE_VAR=1",
        //    "-DHAVE_STRUCT_STAT_ST_RDEV=1",
        //    "-DNO_FSTATFS=1",
        //    "-Duid_t=int",
        //    "-Dgid_t=int",
        //    "-DHAVE_INTPTR_T=1",
        //    "-DHAVE_UINTPTR_T=1",
        //    "-DNO_UNION_WAIT=1",
        //    "-DHAVE_SIGNED_CHAR=1",
        //    "-DHAVE_PUTENV_THAT_COPIES=1",
        //    "-DTCL_UNLOAD_DLLS=1",
        //    "-DHAVE_CPUID=1",
        //});

        //try ac_flags.appendSlice(&.{
        //    "-Dsocklen_t=int",
        //});

        //-DHAVE_ZLIB being deprecated 2024-10
        try ac_flags.appendSlice(&.{
            "-DHAVE_ZLIB=1",
            "-DZIPFS_BUILD=1",
            //"-DSUPPORT_BUILTIN_ZIP_INSTALL=1", // won't compile win 2024-10-11 - bug reported
        });

        try ac_flags.appendSlice(&.{
            // should be for static build only(?)
            "-DTCL_WITH_INTERNAL_ZLIB",
            "-DTCL_TOMMATH",
        });
    } else {
        try ac_flags.appendSlice(&.{
            //"-DTCL_WITH_EXTERNAL_TOMMATH",
            "-DHAVE_MEMORY_H=1",
            "-DMODULE_SCOPE=extern __attribute__((__visibility__(\"hidden\")))",
            "-DHAVE_HIDDEN=1",
            "-DHAVE_SYS_PARAM_H=1",
            "-DUSE_THREAD_ALLOC=1",
            "-D_REENTRANT=1",
            "-D_THREAD_SAFE=1",
            "-DHAVE_PTHREAD_ATTR_SETSTACKSIZE=1",
            "-DHAVE_PTHREAD_ATFORK=1",

            "-D_LARGEFILE64_SOURCE=1",
            "-DTCL_WIDE_INT_IS_LONG=1",
            "-DHAVE_GETCWD=1",
            "-DHAVE_MKSTEMP=1",
            "-DHAVE_OPENDIR=1",
            "-DHAVE_STRTOL=1",
            "-DHAVE_WAITPID=1",
            "-DHAVE_GETNAMEINFO=1",
            "-DHAVE_GETADDRINFO=1",
            "-DHAVE_FREEADDRINFO=1",
            "-DHAVE_GAI_STRERROR=1",
            "-DHAVE_STRUCT_ADDRINFO=1",
            "-DHAVE_STRUCT_IN6_ADDR=1",
            "-DHAVE_STRUCT_SOCKADDR_IN6=1",
            "-DHAVE_STRUCT_SOCKADDR_STORAGE=1",
            "-DHAVE_GETPWUID_R_5=1",
            "-DHAVE_GETPWUID_R=1",
            "-DHAVE_GETPWNAM_R_5=1",
            "-DHAVE_GETPWNAM_R=1",
            "-DHAVE_GETGRGID_R_5=1",
            "-DHAVE_GETGRGID_R=1",
            "-DHAVE_GETGRNAME_R_5=1",
            "-DHAVE_GETGRNAME_R=1",
            "-DHAVE_DECL_GETHOSTBYNAME_R=1",
            "-DHAVE_GETHOSTBYNAME_R_6=1",
            "-DHAVE_GETHOSTBYNAME_R=1",
            "-DHAVE_DECL_GETHOSTBYADDR_R=1",
            "-DHAVE_GETHOSTBYADDR_R_8=1",
            "-DHAVE_GETHOSTBYADDR_R=1",
            "-DHAVE_TERMIOS_H=1",
            "-DHAVE_SYS_IOCTL_H=1",
            "-DHAVE_SYS_TIME_H=1",
            "-DTIME_WITH_SYS_TIME=1",
            "-DHAVE_GMTIME_R=1",
            "-DHAVE_LOCALTIME_R=1",
            "-DHAVE_TM_GMTOFF=1",
            "-DHAVE_TIMEXONE_VAR=1",
            "-DHAVE_STRUCT_STAT_ST_BLOCKS=1",
            "-DHAVE_STRUCT_STAT_ST_BLKSIZE=1",
            "-DHAVE_BLKCNT_T=1",

            "-DNO_UNION_WAIT=1",
            "-DHAVE_SIGNED_CHAR=1",
            "-DHAVE_LANGINFO=1",
            "-DHAVE_MKSTEMPS=1",
            //"-DHAVE_FTS=1",

            "-DTCL_UNLOAD_DLLS=1",
            //"-fPIC",

            try std.fmt.allocPrint(b.allocator, "-DTCL_SHLIB_EXT=\"{s}\"", .{tcl_shlib_ext}),
            try std.fmt.allocPrint(b.allocator, "-DTCL_LIBRARY=\"{s}\"", .{tcl_library}),
        });
    }

    //msvc - test
    //try ac_flags.appendSlice(&.{
    //    "-Dinline=__inline",
    //    "-D_CRT_SECURE_NO_DEPRECATE",
    //    "-D_CRT_NONSTDC_NO_DEPRECATE"
    //});

    //"-Wl,-input-charset=UTF-8",
    //"-finput-charset=UTF-8"

    var warning_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer warning_flags.deinit();
    try warning_flags.appendSlice(&.{
        "-Wall",
        "-Wextra",
        "-Wshadow",
        "-Wundef",
        "-Wwrite-strings",
        "-Wpointer-arith",
        "-Wc++-compat",
        "-fextended-identifiers",
    });
    //"-Werror=return-type",
    var optimize_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer optimize_flags.deinit();

    //windows?
    //try optimize_flags.appendSlice(&.{
    //    "-O0",
    //    "-fomit-frame-pointer",
    //    //"-g0",
    //});
    //try optimize_flags.appendSlice(&.{
    //    "-O3",
    //    "-fomit-frame-pointer",
    //    //"-g0",
    //});
    try optimize_flags.appendSlice(&.{
        "-O3", //??
        //"-O2",
        "-fomit-frame-pointer",
        //"-g",
        "-finput-charset=UTF-8",
    });
    //"-fomit-frame-pointer",

    var c_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer c_flags.deinit();
    try c_flags.appendSlice(optimize_flags.items);
    try c_flags.appendSlice(&.{
        "-DMP_FIXED_CUTOFFS",
        "-fno-sanitize=undefined", //required on windows to fix: linsert {} 0 a a crash
        "-fno-sanitize-trap=undefined",
        //"-DMP_NO_STDINT",
        //"-D__USE_MINGW_ANSI_STDIO=0",
        //"-DTCL_MEM_DEBUG", //must be defined for all modules, or undefined for all modules that are going to be linked together
    });
    if (target.result.os.tag == .linux) {
        //required to avoid error on linux-musl (at least) - review - check other targets
        try c_flags.appendSlice(&.{
            "-fno-sanitize=undefined",
        });
        //without it, gdb gives:
        //Program received signal SIGILL, Illegal instruction.
        //0x0000000001b6c0e6 in Tcl_UniCharToUtfDString (uniStr=0x7fffffffd605, uniLength=0, dsPtr=0x7fffffffcc00) at /mnt/c/buildtcl/2024zig/tcl90/generic/tclUtf.c:332
        //332             while (*w != '\0') {
    }

    var config_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer config_flags.deinit();
    //try config_flags.appendSlice(base_flags.items);
    //can't use ++ for non comptime values such as libdir,bindir...
    try config_flags.appendSlice(&.{
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_LIBDIR=\"{s}\"", .{libdir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_BINDIR=\"{s}\"", .{bindir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_INCDIR=\"{s}\"", .{includedir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_SCRDIR=\"{s}\"", .{tcl_library}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_DOCDIR=\"{s}\"", .{mandir}),
    });
    //todo - set default install dirs: windows c:/tcl90, bsd /usr/local/tcl90?, linux /opt/tcl90?
    try config_flags.appendSlice(&.{
        try std.fmt.allocPrint(b.allocator, "-DCFG_INSTALL_LIBDIR=\"{s}\"", .{libdir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_INSTALL_BINDIR=\"{s}\"", .{bindir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_INSTALL_INCDIR=\"{s}\"", .{includedir}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_INSTALL_SCRDIR=\"{s}\"", .{tcl_library}),
        try std.fmt.allocPrint(b.allocator, "-DCFG_INSTALL_DOCDIR=\"{s}\"", .{mandir}),
    });

    //CFG_RUNTIME_DLLFILE used also on unix? seems to be in generic/tclPkgConfig.c
    try config_flags.appendSlice(&.{
        //"-DCFG_RUNTIME_DLLFILE=\"tcl" ++ tcl_nodot_version ++ ".dll\"",
        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_DLLFILE=\"{s}\"", .{tcl_dll_file}),
    });

    //BUILD_<somelibrary> needs to be defined for windows
    if (target.result.os.tag == .windows) {
        try config_flags.appendSlice(&.{
            "-DBUILD_tcl",
        });
    }

    //CC_SWITCHES = -I"${BUILD_DIR}" -I"${GENERIC_DIR_NATIVE}" -I"${TOMMATH_DIR_NATIVE}" \
    //-I"${ZLIB_DIR_NATIVE}" -I"${WIN_DIR_NATIVE}" \
    //${CFLAGS} ${CFLAGS_WARNING} ${SHLIB_CFLAGS} -DMP_PREC=4 \
    //${AC_FLAGS} ${COMPILE_DEBUG_FLAGS} ${NO_DEPRECATED_FLAGS}
    var cc_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer cc_flags.deinit();
    try cc_flags.appendSlice(c_flags.items);
    try cc_flags.appendSlice(warning_flags.items);
    try cc_flags.appendSlice(config_flags.items);

    try cc_flags.appendSlice(&.{
        "-DMP_PREC=4",
    });
    try cc_flags.appendSlice(ac_flags.items);

    var base_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer base_flags.deinit();
    try base_flags.appendSlice(&.{
        "-municode",
        "-Wl,--subsystem,windows",
        //"-DTCL_MEM_DEBUG", //must be defined for all modules, or undefined for all modules that are going to be linked together
    });

    if (target.result.os.tag == .windows) {
        //TODO win64-arm, win32(?)
        //b.installFile(tcl_source_folder ++ "/compat/zlib/win64/zlib1.dll", "bin/zlib1.dll");
        b.installFile(tcl_source_folder ++ "/libtommath/win64/libtommath.dll", "bin/libtommath.dll");

        //TODO - flag to allow independent building of static vs shared build to give failure independence
        // if STATIC_BUILD
        //b.installFile(tcl_source_folder ++ "/compat/zlib/win64/zlib1.dll", "lib/zdll.lib");
        b.installFile(tcl_source_folder ++ "/libtommath/win64/tommath.lib", "lib/tommath.lib");
    }

    // ================================================================
    //tcl8.7?
    //STUB_OBJS = \
    //    tclStubLib.$(OBJEXT) \
    //    tclTomMathStubLib.$(OBJEXT) \
    //    tclOOStubLib.$(OBJEXT) \
    //    tclWinPanic.$(OBJEXT)
    //tcl9
    //STUB_OBJS =
    //tclStubLib.$(OBJEXT)
    //tclStubCall.$(OBJEXT)
    //tclStubLibTbl.$(OBJEXT)
    //tclTomMathStubLib.$(OBJEXT)
    //tclOOStubLib.$(OBJEXT)
    //tclWinPanic.$(OBJEXT)

    const finalstublib = b.addLibrary(.{
        .linkage = .static,
        .name = if (target.result.os.tag == .windows) "libtclstub" else "tclstub",
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
    var stublib_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try stublib_flags.appendSlice(cc_flags.items);
    try stublib_flags.appendSlice(&.{
        "-DSTATIC_BUILD",
        "-fno-lto",
    });
    //finalstublib.root_module.addIncludePath(.{ .path = tcl_source_folder ++ "/generic" });
    //finalstublib.root_module.addIncludePath(.{ .src_path = tcl_source_folder ++ "/generic" });
    finalstublib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    if (target.result.os.tag == .windows) {
        //finalstublib.root_module.addIncludePath(.{ .path = tcl_source_folder ++ "/win" });
        finalstublib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
    } else {
        //finalstublib.root_module.addIncludePath(.{ .path = tcl_source_folder ++ "/unix" });
        finalstublib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
    }
    if (target.result.os.tag == .windows) {
        finalstublib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/libtommath"));
        finalstublib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
    } else {
        finalstublib.root_module.addIncludePath(b.path(tommath_sourcedir));
        finalstublib.root_module.addIncludePath(b.path(zlib_sourcedir));
    }
    finalstublib.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLib.c"),
        .flags = stublib_flags.items,
    });
    //tcl9

    var stublib_call_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try stublib_call_flags.appendSlice(cc_flags.items);
    try stublib_call_flags.appendSlice(config_flags.items);
    try stublib_call_flags.appendSlice(&.{
        "-DSTATIC_BUILD",
        //try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_BINDIR=\"{s}\"", .{ bindir }),
    });
    //if (target.result.os.tag == .windows) {
    //    try stublib_call_flags.appendSlice(&.{
    //        try std.fmt.allocPrint(b.allocator, "-DCFG_RUNTIME_DLLFILE=\"{s}\"", .{ tcl_dll_file }),
    //    });
    //}

    finalstublib.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubCall.c"),
        .flags = stublib_call_flags.items,
    });
    //tcl9
    var stublib_tbl_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try stublib_tbl_flags.appendSlice(cc_flags.items);
    try stublib_tbl_flags.appendSlice(&.{
        "-DSTATIC_BUILD",
    });
    finalstublib.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLibTbl.c"),
        .flags = stublib_tbl_flags.items,
    });
    var stublib_tom_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try stublib_tom_flags.appendSlice(cc_flags.items);
    try stublib_tom_flags.appendSlice(&.{
        "-fno-lto",
    });
    finalstublib.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclTomMathStubLib.c"),
        .flags = stublib_tom_flags.items,
    });
    var stublib_oo_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try stublib_oo_flags.appendSlice(cc_flags.items);
    try stublib_oo_flags.appendSlice(&.{
        "-fno-lto",
    });
    finalstublib.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclOOStubLib.c"),
        .flags = stublib_oo_flags.items,
    });
    var winpaniclib_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try winpaniclib_flags.appendSlice(cc_flags.items);
    try winpaniclib_flags.appendSlice(&.{
        "-DSTATIC_BUILD",
    });
    if (target.result.os.tag == .windows) {
        finalstublib.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinPanic.c"),
            .flags = winpaniclib_flags.items,
        });
    }

    var windde_obj_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer windde_obj_flags.deinit();
    try windde_obj_flags.appendSlice(cc_flags.items);
    try windde_obj_flags.appendSlice(&.{});
    var winreg_obj_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer winreg_obj_flags.deinit();
    try winreg_obj_flags.appendSlice(cc_flags.items);
    try winreg_obj_flags.appendSlice(&.{});

    if (target.result.os.tag == .windows) {
        finalstublib.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinDde.c"),
            .flags = windde_obj_flags.items,
        });
        finalstublib.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinReg.c"),
            .flags = winreg_obj_flags.items,
        });
    }

    finalstublib.root_module.link_libc = true;

    b.installArtifact(finalstublib);

    // ================================================================

    // Special case object targets

    const winpaniclib = b.addObject(.{
        .name = "tclWinPanic",
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
    if (target.result.os.tag == .windows) {
        winpaniclib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic/"));
        winpaniclib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win/"));
        winpaniclib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/libtommath/"));
        winpaniclib.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/"));
        winpaniclib.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinPanic.c"),
            .flags = winpaniclib_flags.items,
        });
        winpaniclib.root_module.link_libc = true;
    }

    if (target.result.os.tag == .windows) {
        const winreg_obj = b.addObject(.{
        .name = "tclWinReg",
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
        winreg_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic/"));
        winreg_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win/"));
        winreg_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/libtommath/"));
        winreg_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/"));
        winreg_obj.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinReg.c"),
            .flags = winreg_obj_flags.items,
        });
        winreg_obj.root_module.link_libc = true;
        //

        const windde_obj = b.addObject(.{
        .name = "tclWinDde",
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
        windde_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic/"));
        windde_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win/"));
        windde_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/libtommath/"));
        windde_obj.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/"));
        windde_obj.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinDde.c"),
            .flags = windde_obj_flags.items,
        });
        windde_obj.root_module.link_libc = true;
        //DDE_OBJS
    }

    // for linking to Tclsh

    var appinit_path: []const u8 = undefined;
    if (target.result.os.tag == .windows) {
        appinit_path = tcl_source_folder ++ "/win/tclAppInit.c";
    } else {
        appinit_path = tcl_source_folder ++ "/unix/tclAppInit.c";
    }

    //end special case object targets

    // ------------------------------------------------------------------

    //const stubarchive_install_step = &b.addInstallFileWithDir(stubarchive.getEmittedBin(), .prefix, "libtclstubXX.lib").step;
    //b.getInstallStep().dependOn(&b.addInstallFileWithDir(stubarchive.getEmittedBin(),.prefix,"libtclstubXX.a").step);
    //b.getInstallStep().dependOn(stubarchive_install_step);

    const wf = b.addWriteFiles();
    const stublib_file = b.fmt("buildarchive\\{s}", .{finalstublib.out_filename});
    const lz_stublib_file = wf.addCopyFile(finalstublib.getEmittedBin(), stublib_file);

    //s flag to ar should be equivalent to running ranlib
    const create_stublib_archive = b.addSystemCommand(&.{
        "zig",
        "ar",
        "crs",
        "--",
    });

    //no tcl_nodot_version for tcl9 libtclstub.a
    const stublib_archive_file = create_stublib_archive.addOutputFileArg("buildarchive\\" ++ tcl_stub_lib_file);
    //const out_ranlib = run_ranlib.addOutputFileArg("buildarchive\\tclstub.lib");
    create_stublib_archive.addFileArg(lz_stublib_file);

    const installed_stublib_archive = b.addInstallFileWithDir(stublib_archive_file, .prefix, "lib\\" ++ tcl_stub_lib_file);
    //const stublib_archive = b.addInstallFileWithDir(out_ranlib , .prefix, "lib\\tclstub.lib");
    installed_stublib_archive.step.dependOn(&create_stublib_archive.step);
    //b.getInstallStep().dependOn(&stublib_archive.step);

    //dde_dll_file and reg_dll_file need to be added to the zip file
    var dll_flags = std.array_list.Managed([]const u8).init(b.allocator);
    //try dll_flags.appendSlice(base_flags.items);
    try dll_flags.appendSlice(&.{
        "-pipe",
        "-municode",
    });
    if (target.result.os.tag == .windows) {
        try dll_flags.appendSlice(&.{
            "-Wl,--enable-auto-image-base",
            "-static-libgcc",
        });
    } else {}

    //"-Wl,-static-libgcc",

    //std.fs.path.stem(dde_dll_file) ;// tcl9dde14.dll  - tcl9
    //std.fs.path.stem(dde_dll_file8) ;// tcldde14.dll  - tcl8
    const dde_dll = b.addLibrary(.{
        .linkage = .dynamic,
        .name = std.fs.path.stem(dde_dll_file),
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
    dde_dll.step.dependOn(&installed_stublib_archive.step);
    dde_dll.step.dependOn(&finalstublib.step);

    var install_dde_dll: *std.Build.Step.InstallArtifact = undefined;
    if (target.result.os.tag == .windows) {
        dde_dll.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic/"));
        dde_dll.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win/"));
        dde_dll.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/TclWinDde.c"),
            .flags = dll_flags.items,
        });
        //LIBS
        //dde_dll.root_module.addLibraryPath(stublib_archive.source.dirname());
        dde_dll.root_module.addObjectFile(finalstublib.getEmittedBin());
        //dde_dll.root_module.addObjectFile(installed_stublib_archive.source);
        //dde_lib.root_module.linkSystemLibrary("tclstub" ++ tcl_nodot_version);  //libtclstubXX.a
        //dde_lib.root_module.linkSystemLibrary("tclstub", .{}); //tcl9
        dde_dll.root_module.linkSystemLibrary("netapi32", .{});
        dde_dll.root_module.linkSystemLibrary("kernel32", .{});
        dde_dll.root_module.linkSystemLibrary("user32", .{});
        dde_dll.root_module.linkSystemLibrary("advapi32", .{});
        dde_dll.root_module.linkSystemLibrary("userenv", .{});
        dde_dll.root_module.linkSystemLibrary("ws2_32", .{});
        //dde_dll.root_module.addObjectFile(.{ .path = tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a" });
        //dde_dll.root_module.addObjectFile(.{ .path = tcl_source_folder ++ "/compat/zlib/win64/libz.dll.a" });
        dde_dll.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/compat/zlib/win64"));
        dde_dll.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/libtommath/win64"));
        //dde_dll.root_module.linkSystemLibrary("zlib1", .{});
        //### JMN
        dde_dll.root_module.linkLibrary(zlib_lib_compile);
        dde_dll.root_module.linkSystemLibrary("tommath", .{});
        dde_dll.root_module.link_libc = true;
        //b.installArtifact(dde_dll);
        install_dde_dll = b.addInstallArtifact(
            dde_dll,
            .{
                .dest_dir = .{
                    .override = .{ .custom = "./lib/tcl" ++ tcl_dot_version ++ "/dde" },
                },
            },
        );
        //b.default_step.dependOn(&install_dde_dll.step);
    }

    //tcl9registry13.dll - tcl9
    //tclregistry13.dll - tcl8
    const reg_dll = b.addLibrary(.{
        .linkage = .dynamic,
        .name = std.fs.path.stem(reg_dll_file),
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });
    //reg_lib.step.dependOn(&stublib_archive.step);
    reg_dll.step.dependOn(&finalstublib.step);
    var install_reg_dll: *std.Build.Step.InstallArtifact = undefined;
    if (target.result.os.tag == .windows) {
        reg_dll.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic/"));
        reg_dll.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win/"));
        reg_dll.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/TclWinReg.c"),
            .flags = dll_flags.items,
        });
        //LIBS
        //reg_dll.root_module.addLibraryPath(stublib_archive.source.dirname());
        reg_dll.root_module.addObjectFile(finalstublib.getEmittedBin());
        //reg_dll.root_module.linkSystemLibrary("tclstub" ++ tcl_nodot_version);  //libtclstubXX.a
        //reg_dll.root_module.linkSystemLibrary("tclstub", .{}); //tcl9
        reg_dll.root_module.linkSystemLibrary("netapi32", .{});
        reg_dll.root_module.linkSystemLibrary("kernel32", .{});
        reg_dll.root_module.linkSystemLibrary("user32", .{});
        reg_dll.root_module.linkSystemLibrary("advapi32", .{});
        reg_dll.root_module.linkSystemLibrary("userenv", .{});
        reg_dll.root_module.linkSystemLibrary("ws2_32", .{});
        //reg_dll.root_module.addObjectFile(.{ .path = tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a" });
        //reg_dll.root_module.addObjectFile(.{ .path = tcl_source_folder ++ "/compat/zlib/win64/libz.dll.a" });
        reg_dll.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/compat/zlib/win64"));
        reg_dll.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/libtommath/win64"));
        //reg_dll.root_module.linkSystemLibrary("zlib1", .{});
        //### JMN
        reg_dll.root_module.linkLibrary(zlib_lib_compile);
        reg_dll.root_module.linkSystemLibrary("tommath", .{});
        reg_dll.root_module.link_libc = true;
        //b.installArtifact(reg_dll);

        //https://www.reddit.com/r/Zig/comments/1cxn08x/question_how_do_i_setup_a_custom_install_location/
        install_reg_dll = b.addInstallArtifact(
            reg_dll,
            .{
                .dest_dir = .{
                    .override = .{ .custom = "./lib/tcl" ++ tcl_dot_version ++ "/registry" },
                },
            },
        );
        //b.default_step.dependOn(&install_reg_dll.step);
    }

    //COREOBJS
    var generic_sources = std.array_list.Managed([]const u8).init(b.allocator);
    defer generic_sources.deinit();
    try generic_sources.append(tcl_source_folder ++ "/generic/regcomp.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/regexec.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/regfree.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/regerror.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclAlloc.c");

    //tcl9.0
    try generic_sources.append(tcl_source_folder ++ "/generic/tclArithSeries.c");

    try generic_sources.append(tcl_source_folder ++ "/generic/tclAssembly.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclAsync.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclBasic.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclBinary.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCkalloc.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclClock.c");

    //tcl9.0
    try generic_sources.append(tcl_source_folder ++ "/generic/tclClockFmt.c"); //tcl 9?

    try generic_sources.append(tcl_source_folder ++ "/generic/tclCmdAH.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCmdIL.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCmdMZ.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCompCmds.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCompCmdsGR.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCompCmdsSZ.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCompExpr.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclCompile.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclConfig.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclDate.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclDictObj.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclDisassemble.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclEncoding.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclEnsemble.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclEnv.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclEvent.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclExecute.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclFCmd.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclFileName.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclGet.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclHash.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclHistory.c");

    //tcl9.0
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIcu.c");

    try generic_sources.append(tcl_source_folder ++ "/generic/tclIndexObj.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclInterp.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIO.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIOCmd.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIOGT.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIORChan.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIORTrans.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIOSock.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclIOUtil.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclLink.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclLiteral.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclListObj.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclLoad.c");
    //tclmainW mainw_obj
    //try generic_sources.append(tcl_source_folder ++ "/generic/tclMainW.c");

    try generic_sources.append(tcl_source_folder ++ "/generic/tclMain.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclNamesp.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclNotify.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOO.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOBasic.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOCall.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOODefineCmds.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOInfo.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOMethod.c");

    //tcl9.0
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOProp.c");

    try generic_sources.append(tcl_source_folder ++ "/generic/tclOOStubInit.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclObj.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclOptimize.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPanic.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclParse.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPathObj.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPipe.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPkg.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPkgConfig.c"); //pkgconfig_obj
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPosixStr.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclPreserve.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclProc.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclProcess.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclRegexp.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclResolve.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclResult.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclScan.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclStringObj.c");

    //tcl 9.0
    try generic_sources.append(tcl_source_folder ++ "/generic/tclStrIdxTree.c");

    try generic_sources.append(tcl_source_folder ++ "/generic/tclStrToD.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclStubInit.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclThread.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclThreadAlloc.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclThreadJoin.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclThreadStorage.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclTimer.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclTomMathInterface.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclTrace.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclUtf.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclUtil.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclVar.c");
    try generic_sources.append(tcl_source_folder ++ "/generic/tclZipfs.c"); //zipfs_obj
    try generic_sources.append(tcl_source_folder ++ "/generic/tclZlib.c");

    //PLATFORMOBJS - win_source or unix_sources
    var win_sources = std.array_list.Managed([]const u8).init(b.allocator);
    defer win_sources.deinit();
    var unix_sources = std.array_list.Managed([]const u8).init(b.allocator);
    defer unix_sources.deinit();

    switch (target.result.os.tag) {
        .windows => {
            try win_sources.append(tcl_source_folder ++ "/win/tclWin32Dll.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinChan.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinConsole.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinSerial.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinError.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinFCmd.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinFile.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinInit.c"); //wininit_obj
            try win_sources.append(tcl_source_folder ++ "/win/tclWinLoad.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinNotify.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinPipe.c"); //winpipe_obj
            try win_sources.append(tcl_source_folder ++ "/win/tclWinSock.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinThrd.c");
            try win_sources.append(tcl_source_folder ++ "/win/tclWinTime.c");
        },
        else => {
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixChan.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixEvent.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixFCmd.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixFile.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixPipe.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixSock.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixTime.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixInit.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixThrd.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixCompat.c");

            //NOTIFY_SRCS
            try unix_sources.append(tcl_source_folder ++ "/unix/tclEpollNotfy.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclKqueueNotfy.c");
            try unix_sources.append(tcl_source_folder ++ "/unix/tclSelectNotfy.c");
            //try unix_sources.append(tcl_source_folder ++ "/unix/tclUnixNotfy.c");
            switch (target.result.os.tag) {
                .macos => {
                    try unix_sources.append(tcl_source_folder ++ "/unix/tclLoadDyld.c");
                    //MAC_OSX_SRCS
                    try unix_sources.append(tcl_source_folder ++ "/macosx/tclMacOSXBundle.c");
                    try unix_sources.append(tcl_source_folder ++ "/macosx/tclMacOSXFCmd.c");
                    try unix_sources.append(tcl_source_folder ++ "/macosx/tclMacOSXNotify.c");
                },
                else => {
                    try unix_sources.append(tcl_source_folder ++ "/unix/tclLoadDL.c");
                },
            }
        },
    }

    var tommath_sources = std.array_list.Managed([]const u8).init(b.allocator);
    //{
    //    //const subdir = "../libtommath";
    //    //const subdir = tcl_source_folder ++ "/libtommath";
    //    var dir = try fs.cwd().openDir(tommath_sourcedir, .{ .iterate = true });
    //    defer dir.close();
    //    var it = dir.iterate();
    //    const allowed_exts = [_][]const u8{
    //        ".c",
    //    };
    //    while (try it.next()) |entry| {
    //        if (entry.kind == .file) {
    //            const ext = fs.path.extension(entry.name);
    //            const include_file = for (allowed_exts) |e| {
    //                if (std.mem.eql(u8, ext, e)) break true;
    //            } else false;
    //            if (include_file) {
    //                try tommath_sources.append(b.pathJoin(&.{
    //                    tommath_sourcedir,
    //                    entry.name,
    //                }));
    //            }
    //        }
    //    }
    //}

    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_add.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_add_d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_and.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_clamp.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_clear.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_clear_multi.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_cmp.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_cmp_d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_cmp_mag.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_cnt_lsb.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_copy.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_count_bits.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_div.c");
    //tcl9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_div_d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_div_2.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_div_2d.c");

    //tcl9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_div_3.c");

    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_exch.c");
    //tcl9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_expt_n.c");

    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_get_mag_u64.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_grow.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_copy.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_i64.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_multi.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_set.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_size.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_init_u64.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_lshd.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mod.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mod_2d.c");
    //tcl9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mul.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mul_2.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mul_2d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_mul_d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_neg.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_or.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_pack.c");
    //tcl9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_pack_count.c");

    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_radix_size.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_radix_smap.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_read_radix.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_rshd.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_set_i64.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_set_u64.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_shrink.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_sqr.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_sqrt.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_sub.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_sub_d.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_signed_rsh.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_to_ubin.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_to_radix.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_ubin_size.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_unpack.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_xor.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_mp_zero.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_add.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_balance_mul.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_karatsuba_mul.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_karatsuba_sqr.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_mul_digs.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_mul_digs_fast.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_reverse.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_sqr_fast.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_sqr.c");
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_sub.c");
    //tcl 9.0
    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_toom_mul.c");

    try tommath_sources.append(tommath_sourcedir ++ "/bn_s_mp_toom_sqr.c");

    // larger set
    var tcl_objs_static_sources = std.array_list.Managed([]const u8).init(b.allocator);
    defer tcl_objs_static_sources.deinit();
    try tcl_objs_static_sources.appendSlice(generic_sources.items);
    if (target.result.os.tag == .windows) {
        try tcl_objs_static_sources.appendSlice(win_sources.items);
    } else {
        try tcl_objs_static_sources.appendSlice(unix_sources.items);
    }
    try tcl_objs_static_sources.appendSlice(tommath_sources.items);
    if (target.result.os.tag == .windows) {
        var panic_dde_reg_sources = std.array_list.Managed([]const u8).init(b.allocator);
        defer panic_dde_reg_sources.deinit();
        try panic_dde_reg_sources.append(tcl_source_folder ++ "/win/tclWinPanic.c");
        try panic_dde_reg_sources.append(tcl_source_folder ++ "/win/tclWinReg.c");
        try panic_dde_reg_sources.append(tcl_source_folder ++ "/win/tclWinDde.c");
        try tcl_objs_static_sources.appendSlice(panic_dde_reg_sources.items);
    }

    //smaller set
    var tcl_objs_shared_sources = std.array_list.Managed([]const u8).init(b.allocator);
    defer tcl_objs_shared_sources.deinit();
    try tcl_objs_shared_sources.appendSlice(generic_sources.items);
    if (target.result.os.tag == .windows) {
        try tcl_objs_shared_sources.appendSlice(win_sources.items);
    } else {
        try tcl_objs_shared_sources.appendSlice(unix_sources.items);
    }

    //shouldn't need to be added ??
    try tcl_objs_shared_sources.appendSlice(tommath_sources.items);

    var tclobjs_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try tclobjs_flags.appendSlice(cc_flags.items);
    try tclobjs_flags.appendSlice(&.{
        "-DBUILD_tcl",
    });

    // ==============================================================================================================
    const Flaginfo = struct { flags: std.array_list.Managed([]const u8) };
    var build_specials = std.StringHashMap(Flaginfo).init(b.allocator);
    defer build_specials.deinit();
    // --------------------------------------------------------------------------------------------------------------
    var mainw_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer mainw_flags.deinit();

    try build_specials.put("tclWinPanic", .{ .flags = winpaniclib_flags });
    try build_specials.put("tclWinReg", .{ .flags = winreg_obj_flags });
    try build_specials.put("tclWinDde", .{ .flags = windde_obj_flags });

    var appinit_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer appinit_flags.deinit();
    try appinit_flags.appendSlice(cc_flags.items);
    try appinit_flags.appendSlice(&.{
        "-DUNICODE",
        "-D_UNICODE",
    });
    try build_specials.put("tclAppInit", .{ .flags = appinit_flags });

    try mainw_flags.appendSlice(cc_flags.items);
    try mainw_flags.appendSlice(&.{
        "-DBUILD_tcl",
        "-DUNICODE",
        "-D_UNICODE",
    });
    try build_specials.put("tclMain", .{ .flags = mainw_flags });

    var wininit_obj_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer wininit_obj_flags.deinit();
    try wininit_obj_flags.appendSlice(cc_flags.items);
    try wininit_obj_flags.appendSlice(&.{
        "-DBUILD_tcl",
    });
    try build_specials.put("tclWinInit", .{ .flags = wininit_obj_flags });

    //try build_specials.put("tclPkgConfig",.{ .flags = config_flags});
    try build_specials.put("tclPkgConfig", .{ .flags = cc_flags }); //cc_flags includes config_flags

    var zipfs_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer zipfs_flags.deinit();
    try zipfs_flags.appendSlice(cc_flags.items);
    try zipfs_flags.appendSlice(&.{
        "-DBUILD_tcl",
    });
    try build_specials.put("tclZipfs", .{ .flags = zipfs_flags });
    //zipfs_obj.root_module.addIncludePath(.{ .path = tcl_source_folder ++ "/compat/zlib/contrib/minizip" });

    var pipe_obj_flags = std.array_list.Managed([]const u8).init(b.allocator);
    defer pipe_obj_flags.deinit();
    try pipe_obj_flags.appendSlice(cc_flags.items);
    try pipe_obj_flags.appendSlice(&.{
        "-DBUILD_tcl",
    });
    try build_specials.put("tclWinPipe", .{ .flags = pipe_obj_flags });

    // ==============================================================================================================

    const tcl_objs_static = b.addLibrary(.{
        .linkage = .static,
        .name = "tclobjs" ++ tcl_nodot_version,
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });

    tcl_objs_static.root_module.addIncludePath(tcluuid_include_dir); //overlay first (G-102)
    tcl_objs_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    if (target.result.os.tag == .windows) {
        tcl_objs_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
    } else {
        tcl_objs_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
    }
    tcl_objs_static.root_module.addIncludePath(b.path(tommath_sourcedir));
    tcl_objs_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
    tcl_objs_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/contrib/minizip")); //only required by tclZipfs - but ok for all?

    //tclMain.c needs to be built twice on windows - with and without unicode flags.
    //The UNICODE copy is already produced by the generic sources loop (build_specials
    //maps tclMain -> mainw_flags); the ansi copy is added to the exe below. A second
    //explicit UNICODE add here was harmless under zig 0.14.0-dev.2074 (the duplicate
    //archive member was never extracted) but zig 0.14.1 links it -> duplicate symbols.
    //if (target.result.os.tag == .windows) {
    //    tcl_objs_static.root_module.addCSourceFile(.{
    //        .file = b.path(tcl_source_folder ++ "/generic/tclMain.c"),
    //        .flags = mainw_flags.items,
    //    });
    //}
    var current_flagset: std.array_list.Managed([]const u8) = undefined;
    for (tcl_objs_static_sources.items) |src| {
        if (build_specials.get(std.fs.path.stem(src))) |val| {
            //std.debug.print(">>> {s}\n", .{ std.fs.path.stem(src)});
            current_flagset = val.flags;
        } else {
            //std.debug.print("--- {s}", .{ std.fs.path.stem(src)});
            current_flagset = tclobjs_flags;
        }
        tcl_objs_static.root_module.addCSourceFile(.{
            .file = b.path(src),
            .flags = current_flagset.items,
        });
    }
    tcl_objs_static.root_module.link_libc = true;
    //b.installArtifact(tcl_objs);

    //const tcl_objs_shared = b.addLibrary(.{
    //    .linkage = .static,
    //    .name = "tclobjsshared" ++ tcl_nodot_version,
    //    .root_module = b.createModule(.{ .target = target, .optimize = optimize }),
    //});
    //tcl_objs_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    //if (target.result.os.tag == .windows) {
    //    tcl_objs_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
    //} else {
    //    tcl_objs_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
    //}
    //tcl_objs_shared.root_module.addIncludePath(b.path(tommath_sourcedir));
    //tcl_objs_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
    //tcl_objs_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/contrib/minizip")); //only required by tclZipfs - but ok for all?
    //if (target.result.os.tag == .windows) {
    //    tcl_objs_shared.root_module.addCSourceFile(.{
    //        .file = b.path(tcl_source_folder ++ "/generic/tclMain.c"),
    //        .flags = mainw_flags.items,
    //    });
    //}
    //var current_flagset_obj_shared: std.array_list.Managed([]const u8) = undefined;
    //for (tcl_objs_shared_sources.items) |src| {
    //    if (build_specials.get(std.fs.path.stem(src))) |val| {
    //        //std.debug.print(">>> {s}\n", .{ std.fs.path.stem(src)});
    //        current_flagset_obj_shared = val.flags;
    //    } else {
    //        //std.debug.print("--- {s}", .{ std.fs.path.stem(src)});
    //        current_flagset_obj_shared = tclobjs_flags;
    //    }
    //    tcl_objs_shared.root_module.addCSourceFile(.{
    //        .file = b.path(src),
    //        .flags = current_flagset_obj_shared.items,
    //    });
    //}
    ////tcl_objs_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a"));
    //tcl_objs_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/libtommath/win64/tommath.lib"));
    ////tcl_objs_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/compat/zlib/win64/libz.dll.a"));
    //tcl_objs_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/compat/zlib/win64/zdll.lib"));
    //tcl_objs_shared.root_module.link_libc = true;

    //-- --- ---

    //const tcl_lib_static = b.addLibrary(.{
    //    .linkage = .static,
    //    //libtcl90.dll.a ? - zig will append .lib or .a?
    //    .name = if (target.result.os.tag == .windows) "libtcl" ++ tcl_nodot_version ++ ".dll"  else "libtcl" ++ tcl_nodot_version ++ ".so",
    //    .root_module = b.createModule(.{ .target = target, .optimize = optimize }),
    //});

    ////jmn3 -test
    //tcl_lib_static.step.dependOn(&zlib_lib_compile.step);
    ////tcl_lib_static.step.dependOn(&tommath_lib_compile.step);

    //tcl_lib_static.step.dependOn(&wf_uuidh.step);
    //tcl_lib_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    //if (target.result.os.tag == .windows) {
    //    tcl_lib_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
    //} else {
    //    tcl_lib_static.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
    //}
    //tcl_lib_static.root_module.addIncludePath(b.path(tommath_sourcedir));
    //if (target.result.os.tag == .windows) {
    //    tcl_lib_static.root_module.addIncludePath(b.path(zlib_sourcedir));
    //    tcl_lib_static.root_module.addIncludePath(b.path(zlib_sourcedir ++ "/contrib/minizip")); //only required by tclZipfs - but ok for all?
    //} else {
    //    //tcl_lib_static.root_module.addIncludePath(b.path("../zlib"));
    //    //tcl_lib_static.root_module.addIncludePath(b.path("../zlib/contrib/minizip"));
    //    tcl_lib_static.root_module.addIncludePath(b.path(zlib_sourcedir));
    //    tcl_lib_static.root_module.addIncludePath(b.path(zlib_sourcedir ++ "/contrib/minizip")); //only required by tclZipfs - but ok for all?
    //}

    //for (tcl_lib_sources.items) |src| {
    //    if (build_specials.get(std.fs.path.stem(src))) |val| {
    //        //std.debug.print(">>> {s}\n", .{ std.fs.path.stem(src)});
    //        current_flagset = val.flags;
    //    } else {
    //        //std.debug.print("--- {s}", .{ std.fs.path.stem(src)});
    //        current_flagset = tclobjs_flags;
    //    }
    //    tcl_lib_static.root_module.addCSourceFile(.{
    //        .file = b.path(src),
    //        .flags = current_flagset.items,
    //    });
    //}

    //jmn3
    //tcl_lib_static.root_module.linkLibrary(zlib_lib_compile);
    //tcl_lib_static.root_module.linkLibrary(tommath_lib_compile);

    //tcl_lib_static.root_module.link_libc = true;
    //b.installArtifact(tcl_lib_static);

    // ==============================================================================================================
    // ==============================================================================================================

    //tclXX.dll or .so
    var tcl_lib_shared_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try tcl_lib_shared_flags.appendSlice(base_flags.items);
    try tcl_lib_shared_flags.appendSlice(&.{
        "-pipe",
        "-municode",
    });
    if (target.result.os.tag == .windows) {
        try tcl_lib_shared_flags.appendSlice(&.{
            "-static-libgcc",
        });

        //jmn3
        try tcl_lib_shared_flags.appendSlice(&.{
            "-Wl,-out-implib,tcl90.dll.a",
        });
    }
    //try tcl_slib_flags.appendSlice(&.{
    //    "-DUNICODE",
    //    "-D_UNICODE",
    //});
    try tcl_lib_shared_flags.appendSlice(c_flags.items);

    const tcl_lib_shared = b.addLibrary(.{
        .linkage = .dynamic,
        .name = "tcl" ++ tcl_nodot_version,
        .root_module = b.createModule(.{
            .target = target,
            .optimize = optimize,
        }),
    });

    //tcl_lib_shared.verbose_link = true;
    //tcl_lib_shared.setVerboseLink(true);
    //tcl_lib_shared.step.dependOn(&tcl_objs_shared.step);

    //jmn3 test
    //if (target.result.os.tag == .linux) {
    //    tcl_slib.step.dependOn(&zlib_lib_compile.step);
    //}

    tcl_lib_shared.root_module.addIncludePath(tcluuid_include_dir); //overlay first (G-102)
    tcl_lib_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    if (target.result.os.tag == .windows) {
        tcl_lib_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
        tcl_lib_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
        tcl_lib_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/contrib/minizip"));
    } else {
        tcl_lib_shared.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
        tcl_lib_shared.root_module.addIncludePath(b.path(zlib_sourcedir));
        tcl_lib_shared.root_module.addIncludePath(b.path(zlib_sourcedir ++ "/contrib/minizip")); //only required by tclZipfs - but ok for all?
    }
    tcl_lib_shared.root_module.addIncludePath(b.path(tommath_sourcedir));

    // ---
    // ?? needed for shared lib?
    //if (target.result.os.tag == .windows) {
    //    tcl_lib_shared.root_module.addCSourceFile(.{
    //        .file = b.path(tcl_source_folder ++ "/generic/tclMain.c"),
    //        .flags = mainw_flags.items,
    //    });
    //}
    // ---
    for (tcl_objs_shared_sources.items) |src| {
        if (build_specials.get(std.fs.path.stem(src))) |val| {
            //std.debug.print(">>> {s}\n", .{ std.fs.path.stem(src)});
            current_flagset = val.flags;
        } else {
            //std.debug.print("--- {s}", .{ std.fs.path.stem(src)});
            current_flagset = tclobjs_flags;
        }
        tcl_lib_shared.root_module.addCSourceFile(.{
            .file = b.path(src),
            .flags = current_flagset.items,
        });
    }

    if (target.result.os.tag == .windows) {
        tcl_lib_shared.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/compat/zlib/win64"));
        tcl_lib_shared.root_module.addLibraryPath(b.path(tcl_source_folder ++ "/libtommath/win64"));
    }

    if (target.result.os.tag == .windows) {
        //tcl_lib_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a"));
        //tcl_lib_shared.root_module.addObjectFile(b.path(tcl_source_folder ++ "/compat/zlib/win64/libz.dll.a"));
        tcl_lib_shared.root_module.linkSystemLibrary("tommath", .{ .preferred_link_mode = .dynamic });
        //tcl_lib_shared.root_module.linkSystemLibrary("zlib1", .{ .preferred_link_mode = .dynamic });
        tcl_lib_shared.root_module.linkLibrary(zlib_lib_compile);
        //tcl_lib_shared.root_module.linkSystemLibrary("tommath", .{});
        //tcl_lib_shared.root_module.linkSystemLibrary("zlib1", .{});
    } else {
        //tcl_lib_shared.root_module.linkLibrary(tommath_lib_compile);
        tcl_lib_shared.root_module.linkLibrary(zlib_lib_compile);
        //tcl_lib_shared.root_module.linkSystemLibrary("zlib1", .{});
    }
    //JMN2024 install_path problem (sub_path is expected to be relative to the build root)
    //tcl_lib_shared.root_module.addLibraryPath(b.path( b.pathJoin(&.{ b.install_path, "" }) ));
    tcl_lib_shared.root_module.link_libc = true;

    //SHLIB_LD_LIBS (LIBS)
    if (target.result.os.tag == .windows) {
        tcl_lib_shared.root_module.linkSystemLibrary("netapi32", .{});
        tcl_lib_shared.root_module.linkSystemLibrary("kernel32", .{});
        tcl_lib_shared.root_module.linkSystemLibrary("user32", .{});
        tcl_lib_shared.root_module.linkSystemLibrary("advapi32", .{});
        tcl_lib_shared.root_module.linkSystemLibrary("userenv", .{});
        tcl_lib_shared.root_module.linkSystemLibrary("ws2_32", .{});
    }
    //tclshlib.root_module.linkSystemLibrary("libtommath", .{});
    //tclshlib.root_module.linkSystemLibrary("zlib1", .{});
    tcl_lib_shared.root_module.addWin32ResourceFile(.{
        .file = b.path(tcl_source_folder ++ "/win/tcl.rc"),
        .flags = &.{
            "/I",
            tcl_source_folder ++ "/generic",
        },
    });
    b.installArtifact(tcl_lib_shared);

    var ldflags_console = std.array_list.Managed([]const u8).init(b.allocator);
    if (target.result.os.tag == .windows) {
        try ldflags_console.appendSlice(&.{
            "-mconsole",
            "-static-libgcc",
            "-Wl,--enable-auto-image-base",
            "-Wl,--subsystem,console",
            "-DTCL_BROKEN_MAINARGS",
        });
    }
    try ldflags_console.appendSlice(&.{
        //"-mwindows",
        "-pipe",
        "-municode",
    });
    //"-DTCL_MEM_DEBUG",

    var tclsh_flags = std.array_list.Managed([]const u8).init(b.allocator);
    try tclsh_flags.appendSlice(c_flags.items);
    try tclsh_flags.appendSlice(appinit_flags.items);
    try tclsh_flags.appendSlice(ldflags_console.items);

    const tclsh_exe = b.addExecutable(.{
        .name = tclsh_static,
        //e.g tclsh90s (becomes tclsh90s.exe on windows)
        //.root_source_file = .{ .path = appinit_path},
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
        }),
    });
    //9.0.5 sources dropped TCL_BROKEN_MAINARGS: tclAppInit.c now provides _tmain, which is
    //wmain under -DUNICODE, so the mingw CRT must use the unicode entry (zig's -municode).
    tclsh_exe.mingw_unicode_entry_point = true;
    //tclsh_exe.setVerboseLink(true);
    //tclsh_exe.link_gc_sections = false;
    //tclsh_exe.want_lto = false;
    tclsh_exe.step.dependOn(&finalstublib.step);
    //tclsh.step.dependOn(&install_tcl_lib_file.step);
    tclsh_exe.step.dependOn(&tcl_objs_static.step);
    //tclsh_exe.step.dependOn(&tcl_lib_shared.step);
    //tclsh_exe.step.dependOn(&tommath_lib_compile.step);
    //JMN3 test
    //if (target.result.os.tag == .linux) {
    //    tclsh_exe.step.dependOn(&zlib_lib_compile.step);
    //}

    tclsh_exe.root_module.addIncludePath(tcluuid_include_dir); //overlay first (G-102)
    tclsh_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    if (target.result.os.tag == .windows) {
        tclsh_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
        tclsh_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
        tclsh_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/contrib/minizip"));
    } else {
        tclsh_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
        tclsh_exe.root_module.addIncludePath(b.path(zlib_sourcedir));
        tclsh_exe.root_module.addIncludePath(b.path(zlib_sourcedir ++ "/contrib/minizip"));
    }
    tclsh_exe.root_module.addIncludePath(b.path(tommath_sourcedir));

    //tclMain needs to be compiled twice on windows - with and without unicode
    //we have already configured the one in the sources list to compile with mainw_flags (DUNICODE etc)
    if (target.result.os.tag == .windows) {
        //The ansi copy must NOT see UNICODE: undefine explicitly (the zig cc driver can
        //supply windows-default defines - observed with zig 0.14.1 as duplicate
        //Tcl_MainExW/common symbols vs the mainw copy) and use upstream's
        //TCL_ASCII_MAIN guard so only the ascii Tcl_MainEx variant is emitted.
        var mainansi_flags = std.array_list.Managed([]const u8).init(b.allocator);
        defer mainansi_flags.deinit();
        try mainansi_flags.appendSlice(tclobjs_flags.items);
        try mainansi_flags.appendSlice(&.{
            "-UUNICODE",
            "-U_UNICODE",
            "-DTCL_ASCII_MAIN",
        });
        tclsh_exe.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/generic/tclMain.c"),
            .flags = mainansi_flags.items,
        });
    }
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(appinit_path),
        .flags = tclsh_flags.items,
    });
    // TCL_LIB_FILE  libtclxx.dll.a  (not the implib which is tclxx.dll.a)
    // --
    //tclsh_exe.root_module.addObjectFile(install_tcl_lib_file.source);
    //tclsh_exe.root_module.addObjectFile(tcl_lib_static.getEmittedBin());
    for (tcl_objs_static_sources.items) |src| {
        if (build_specials.get(std.fs.path.stem(src))) |val| {
            std.debug.print(">>> {s}\n", .{std.fs.path.stem(src)});
            current_flagset = val.flags;
        } else {
            //std.debug.print("--- {s}", .{ std.fs.path.stem(src)});
            current_flagset = tclobjs_flags;
        }
        tclsh_exe.root_module.addCSourceFile(.{
            .file = b.path(src),
            .flags = current_flagset.items,
        });
    }
    //tclsh_exe.root_module.addObjectFile(finalstublib.getEmittedBin());
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLib.c"),
        .flags = stublib_flags.items,
    });
    //experiment
    //tclsh_exe.root_module.addCSourceFiles(.{
    //    .files = &.{
    //        "generic/tclStubCall.c",
    //        "tclStubLibTbl.c",
    //    },
    //    .flags = stublib_call_flags.items,
    //});

    //tcl9
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubCall.c"),
        .flags = stublib_call_flags.items,
    });
    //tcl9
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLibTbl.c"),
        .flags = stublib_tbl_flags.items,
    });
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclTomMathStubLib.c"),
        .flags = stublib_tom_flags.items,
    });
    tclsh_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclOOStubLib.c"),
        .flags = stublib_oo_flags.items,
    });
    if (target.result.os.tag == .windows) {
        tclsh_exe.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinPanic.c"),
            .flags = winpaniclib_flags.items,
        });
    }
    if (target.result.os.tag == .windows) {
        tclsh_exe.root_module.linkSystemLibrary("netapi32", .{});
        tclsh_exe.root_module.linkSystemLibrary("kernel32", .{});
        tclsh_exe.root_module.linkSystemLibrary("user32", .{});
        tclsh_exe.root_module.linkSystemLibrary("advapi32", .{});
        tclsh_exe.root_module.linkSystemLibrary("userenv", .{});
        tclsh_exe.root_module.linkSystemLibrary("ws2_32", .{});
    }
    if (target.result.os.tag == .windows) {
        tclsh_exe.root_module.addObjectFile(b.path(tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a"));
        //### jmn
        //tclsh_exe.root_module.addObjectFile(b.path(tcl_source_folder ++ "/compat/zlib/win64/libz.dll.a"));
    } else {
        //tclsh_exe.root_module.linkLibrary(tommath_lib_compile);
        //tclsh_exe.root_module.linkLibrary(zlib_lib_compile);
    }
    //### jmn
    tclsh_exe.step.dependOn(&zlib_lib_compile.step);
    tclsh_exe.root_module.linkLibrary(zlib_lib_compile);
    //tclsh.root_module.addLibraryPath(.{ .path = tcl_source_folder ++ "/compat/zlib/win64"});
    //tclsh.root_module.addLibraryPath(.{ .path = tcl_source_folder ++ "/libtommath/win64"});
    //tclsh.root_module.linkSystemLibrary("zlib1", .{});
    //tclsh.root_module.linkSystemLibrary("tommath", .{});

    //////////////////// tclvfs
    //const tclvfs_compile = try tclvfs_static.build_tclvfs(tcl_source_folder, "../tclvfs", b, target, optimize, finalstublib);
    //const build_tclvfs_step = b.step("build-tclvfs", "build tclvfs static library");
    //build_tclvfs_step.dependOn(&tclvfs_compile.step);
    //tclsh_exe.step.dependOn(&tclvfs_compile.step);
    //tclsh_exe.root_module.linkLibrary(tclvfs_compile);
    ////////////////////
    const tclvfs_compile = try tclvfs_shared.build_tclvfs(tcl_source_folder, "../tclvfs", b, target, optimize, finalstublib);
    const build_tclvfs_step = b.step("build-tclvfs", "build tclvfs shared library");
    build_tclvfs_step.dependOn(&tclvfs_compile.step);
    tclsh_exe.step.dependOn(&tclvfs_compile.step); // review
    if (target.result.os.tag == .windows) {
        //G-102: vfs script package (lib/vfs1.4.2) installed by the recipe - the repl
        //code interp wants vfs/vfs::zip (modpod mounting). Formerly suite.tcl post-build.
        try tclvfs_shared.install_tclvfs_package("../tclvfs", b, tclvfs_compile);
    }
    ////////////////////

    //vqtcl/vlerq removed from the suite (user 2026-07-20): it was an attempt at old
    //tclkit support and its source has no confirmed public upstream. When tclkit
    //builds are investigated, TEMP_REFERENCE/metakit and TEMP_REFERENCE/KitCreator
    //in the punkshell repo are the reference material.

    tclsh_exe.root_module.link_libc = true;

    //LDFLAGS_CONSOLE= -mconsole -pipe -static-libgcc -municode -Wl,--enable-auto-image-base
    //rc compiled from the overlay copy (generated tclsh.exe.manifest beside it);
    //tclsh.ico + tcl.h resolve via the include paths.
    tclsh_exe.root_module.addWin32ResourceFile(.{
        .file = tclshrc_overlay,
        .include_paths = &.{
            b.path(tcl_source_folder ++ "/generic"),
            b.path(tcl_source_folder ++ "/win"),
        },
    });
    const install_tclsh = b.addInstallArtifact(tclsh_exe, .{});
    std.debug.print("\n", .{});
    std.debug.print("tclsh.kind {s}\n", .{@tagName(tclsh_exe.kind)});
    std.debug.print("prefix {s}\n", .{b.install_path});
    b.getInstallStep().dependOn(&install_tclsh.step);

    //---------------------------------------------------------------------
    //tclsh90spr: the TCLSH_PIPEREPL-patched shell (G-096). Identical to
    //tclsh90s except tclMain.c is replaced by patches/tclMain_piperepl_905.c
    //(rebased 2024 patch; gate default flipped per the G-103 punk-kit policy:
    //enabled unless TCLSH_PIPEREPL=0 - see patches/README.md). Kept as a
    //SEPARATE product so the stock shells stay byte-for-byte unpatched.
    const tclsh_pr_exe = b.addExecutable(.{
        .name = tclsh_static ++ "pr",
        .root_module = b.createModule(.{
            .root_source_file = b.path("src/main.zig"),
            .target = target,
            .optimize = optimize,
        }),
    });
    tclsh_pr_exe.mingw_unicode_entry_point = true;
    tclsh_pr_exe.step.dependOn(&finalstublib.step);
    tclsh_pr_exe.step.dependOn(&tcl_objs_static.step);
    tclsh_pr_exe.root_module.addIncludePath(tcluuid_include_dir); //overlay first (G-102)
    tclsh_pr_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/generic"));
    if (target.result.os.tag == .windows) {
        tclsh_pr_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/win"));
        tclsh_pr_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib"));
        tclsh_pr_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/compat/zlib/contrib/minizip"));
    } else {
        tclsh_pr_exe.root_module.addIncludePath(b.path(tcl_source_folder ++ "/unix"));
        tclsh_pr_exe.root_module.addIncludePath(b.path(zlib_sourcedir));
        tclsh_pr_exe.root_module.addIncludePath(b.path(zlib_sourcedir ++ "/contrib/minizip"));
    }
    tclsh_pr_exe.root_module.addIncludePath(b.path(tommath_sourcedir));
    if (target.result.os.tag == .windows) {
        //ansi copy of the patched main (see the stock shell's mainansi note above)
        var pr_mainansi_flags = std.array_list.Managed([]const u8).init(b.allocator);
        try pr_mainansi_flags.appendSlice(tclobjs_flags.items);
        try pr_mainansi_flags.appendSlice(&.{
            "-UUNICODE",
            "-U_UNICODE",
            "-DTCL_ASCII_MAIN",
        });
        tclsh_pr_exe.root_module.addCSourceFile(.{
            .file = b.path("patches/tclMain_piperepl_905.c"),
            .flags = pr_mainansi_flags.items,
        });
    }
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(appinit_path),
        .flags = tclsh_flags.items,
    });
    for (tcl_objs_static_sources.items) |src| {
        if (build_specials.get(std.fs.path.stem(src))) |val| {
            current_flagset = val.flags;
        } else {
            current_flagset = tclobjs_flags;
        }
        if (std.mem.eql(u8, std.fs.path.stem(src), "tclMain")) {
            //the unicode copy: patched file in place of stock, same special flags
            tclsh_pr_exe.root_module.addCSourceFile(.{
                .file = b.path("patches/tclMain_piperepl_905.c"),
                .flags = current_flagset.items,
            });
        } else {
            tclsh_pr_exe.root_module.addCSourceFile(.{
                .file = b.path(src),
                .flags = current_flagset.items,
            });
        }
    }
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLib.c"),
        .flags = stublib_flags.items,
    });
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubCall.c"),
        .flags = stublib_call_flags.items,
    });
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclStubLibTbl.c"),
        .flags = stublib_tbl_flags.items,
    });
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclTomMathStubLib.c"),
        .flags = stublib_tom_flags.items,
    });
    tclsh_pr_exe.root_module.addCSourceFile(.{
        .file = b.path(tcl_source_folder ++ "/generic/tclOOStubLib.c"),
        .flags = stublib_oo_flags.items,
    });
    if (target.result.os.tag == .windows) {
        tclsh_pr_exe.root_module.addCSourceFile(.{
            .file = b.path(tcl_source_folder ++ "/win/tclWinPanic.c"),
            .flags = winpaniclib_flags.items,
        });
        tclsh_pr_exe.root_module.linkSystemLibrary("netapi32", .{});
        tclsh_pr_exe.root_module.linkSystemLibrary("kernel32", .{});
        tclsh_pr_exe.root_module.linkSystemLibrary("user32", .{});
        tclsh_pr_exe.root_module.linkSystemLibrary("advapi32", .{});
        tclsh_pr_exe.root_module.linkSystemLibrary("userenv", .{});
        tclsh_pr_exe.root_module.linkSystemLibrary("ws2_32", .{});
        tclsh_pr_exe.root_module.addObjectFile(b.path(tcl_source_folder ++ "/libtommath/win64/libtommath.dll.a"));
    }
    tclsh_pr_exe.step.dependOn(&zlib_lib_compile.step);
    tclsh_pr_exe.root_module.linkLibrary(zlib_lib_compile);
    tclsh_pr_exe.step.dependOn(&tclvfs_compile.step); // review (parity with stock shell)
    tclsh_pr_exe.root_module.link_libc = true;
    tclsh_pr_exe.root_module.addWin32ResourceFile(.{
        .file = tclshrc_overlay,
        .include_paths = &.{
            b.path(tcl_source_folder ++ "/generic"),
            b.path(tcl_source_folder ++ "/win"),
        },
    });
    const install_tclsh_pr = b.addInstallArtifact(tclsh_pr_exe, .{});
    b.getInstallStep().dependOn(&install_tclsh_pr.step);
    //---------------------------------------------------------------------

    //OPTIONAL steps
    const install_tzdata_step = b.step("install-tzdata", "install tcl timezone data");

    //addInstallDirectory is recursive
    const tzdata_install = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library/tzdata"),
        .install_dir = .prefix,
        .install_subdir = b.pathJoin(&.{ script_install_dir_rel, "tzdata" }),
    });
    install_tzdata_step.dependOn(&tzdata_install.step);

    //****************************
    //zig build install-libraries
    const install_libraries = b.step("install-libraries", "install tcl libraries,tzdata,msgs (not required if zipfs being used)");
    install_libraries.dependOn(&tclsh_exe.step);
    if (target.result.os.tag == .windows) {
        install_libraries.dependOn(&reg_dll.step);
        install_libraries.dependOn(&dde_dll.step);
    }

    //Whole library tree -> lib/tcl9.0 (stock-install parity, G-098 finding: the
    //library's own pkgIndex.tcl references subdir packages such as msgcat/ opt/
    //cookiejar/ - installing only top-level .tcl files leaves phantom ifneeded
    //entries pointing at files that were never installed).
    const install_library_tree = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library"),
        .install_dir = .prefix,
        .install_subdir = "lib/tcl" ++ tcl_dot_version,
    });
    install_libraries.dependOn(&install_library_tree.step);

    //(G-102: the former per-file top-level library install loop - a configure-time
    //directory iteration - was removed as redundant: install_library_tree above
    //already installs the whole library tree, top-level files included, to the same
    //lib/tcl9.0 destination.)

    //Makefile for tcl9.0b1 uses target folder <tcl_library>/opt0.4 <tcl_library>/cookiejar0.2 - but we don't really need the version as part of the folder structure
    //At least some distributions of tcl9 don't include the version - which seems simpler
    const cookiejar_install = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library/cookiejar"),
        .include_extensions = &.{ ".tcl", ".gz" },
        .install_dir = .prefix,
        //.install_subdir = b.pathJoin(&.{ script_install_dir_rel, "cookiejar0.2" }),
        .install_subdir = b.pathJoin(&.{ script_install_dir_rel, "cookiejar" }),
    });
    install_libraries.dependOn(&cookiejar_install.step);

    //(G-102: the former decorative 'echo --Installing package X--' banner steps were
    //removed - 'echo' is a cmd builtin, and spawning it as a program only worked when
    //a coreutils echo.exe happened to be on PATH; in a scrubbed environment the five
    //banner spawns failed and took install-libraries down transitively.)
    //tm modules under the module path (lib/tcl9/9.0). Version-stamped names follow
    //the checkout's library tree; single source for the prefix install AND the
    //G-103 family staging (a kit's tm root is /app/tcl9/<ver> - tm.tcl anchors at
    //the dirname of the attached tcl_library).
    const tm_installs = [_]struct { src: []const u8, tm: []const u8 }{
        .{ .src = "/library/http/http.tcl", .tm = "http-2.10.2.tm" },
        .{ .src = "/library/msgcat/msgcat.tcl", .tm = "msgcat-1.7.1.tm" },
        .{ .src = "/library/tcltest/tcltest.tcl", .tm = "tcltest-2.5.11.tm" },
        .{ .src = "/library/platform/platform.tcl", .tm = "platform-1.1.1.tm" },
        .{ .src = "/library/platform/shell.tcl", .tm = "platform/shell-1.1.4.tm" },
    };
    inline for (tm_installs) |tmi| {
        const tm_inst = b.addInstallFileWithDir(b.path(tcl_source_folder ++ tmi.src), .prefix, b.pathJoin(&.{ module_install_dir_rel, tcl_dot_version, tmi.tm }));
        install_libraries.dependOn(&tm_inst.step);
    }
    //opt/*.tcl

    const opt_tcl_install = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library/opt"),
        .include_extensions = &.{".tcl"},
        .install_dir = .prefix,
        //.install_subdir = b.pathJoin(&.{ script_install_dir_rel, "opt0.4" }),
        .install_subdir = b.pathJoin(&.{ script_install_dir_rel, "opt" }),
    });
    install_libraries.dependOn(&opt_tcl_install.step);

    const opt_registry_install = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library/registry"),
        .include_extensions = &.{".tcl"},
        .install_dir = .prefix,
        .install_subdir = b.pathJoin(&.{ script_install_dir_rel, "registry" }),
    });
    install_libraries.dependOn(&opt_registry_install.step);
    const pkgindex_install = b.addInstallFile(b.path(tcl_source_folder ++ "/library/manifest.txt"), b.pathJoin(&.{ script_install_dir_rel, "pkgIndex.tcl" }));
    install_libraries.dependOn(&pkgindex_install.step);

    const encodings_install = b.addInstallDirectory(.{
        .source_dir = b.path(tcl_source_folder ++ "/library/encoding"),
        .include_extensions = &.{".enc"},
        .install_dir = .prefix,
        .install_subdir = b.pathJoin(&.{ script_install_dir_rel, "encoding" }),
    });
    install_libraries.dependOn(&encodings_install.step);
    install_libraries.dependOn(install_tzdata_step);

    if (target.result.os.tag == .windows) {
        install_libraries.dependOn(&install_dde_dll.step);
        //G-098: the registry install artifact existed but was hooked to nothing -
        //library/registry/pkgIndex.tcl then pointed at a dll never installed
        //(punkshell's punk module probes 'package require registry' at load).
        install_libraries.dependOn(&install_reg_dll.step);
    }

    //****************************

    //****************************
    //zig build install-libraries

    const make_vfs_root = b.addWriteFiles();
    const tcl_library_path = make_vfs_root.addCopyDirectory(b.path(tcl_source_folder ++ "/library"), "base/tcl_library", .{});
    //_ = make_vfs_root.addCopyDirectory(b.path(tcl_source_folder ++ "/library"), "tcl_library", .{});
    _ = make_vfs_root.addCopyFile(b.path(tcl_source_folder ++ "/library/manifest.txt"), "base/tcl_library/pkgIndex.tcl");
    _ = make_vfs_root.addCopyFile(b.path(tcl_source_folder ++ "/library/manifest.txt"), "base/tcl_library/pkgIndex.tcl");

    if (target.result.os.tag == .windows) {
        _ = make_vfs_root.addCopyFile(install_dde_dll.artifact.getEmittedBin(), "base/tcl_library/dde/" ++ dde_dll_file);
        //_ = make_vfs_root.addCopyFile(dde_dll.getEmittedBin(), "tcl_library/dde/" ++ dde_dll_file);
        _ = make_vfs_root.addCopyFile(reg_dll.getEmittedBin(), "base/tcl_library/registry/" ++ reg_dll_file);

        make_vfs_root.step.dependOn(&reg_dll.step);
        make_vfs_root.step.dependOn(&dde_dll.step);
    }

    //make_vfs_root.step.dependOn(&tclvfs_compile.step);
    // The build_tclvfs_xxx.zig module is responsible for what files tclvfs needs to add the vfs root
    // -pass it the *WriteFile we're building and let it add stuff

    // *****************************
    //  tclvfs shared/static - todo
    //_ = try tclvfs_static.vfsadd_tclvfs_files(tcl_source_folder, "../tclvfs", b, make_vfs_root);
    _ = try tclvfs_shared.vfsadd_tclvfs_files(tcl_source_folder, "../tclvfs", b, make_vfs_root);
    //hack
    const tclvfs_info = tclvfs_shared.versionInfo(b, "../tclvfs");
    _ = make_vfs_root.addCopyFile(tclvfs_compile.getEmittedBin(), b.fmt("base/lib/vfs{s}/{s}", .{ tclvfs_info.dotversion, tclvfs_info.dll_file }));
    // *****************************

    //vqtcl/vlerq zip payload removed with the rest of the vqtcl wiring (user 2026-07-20;
    //old-tclkit experiment - see TEMP_REFERENCE/metakit + TEMP_REFERENCE/KitCreator).

    //pass make_vfs_root to build_tclvfs

    make_vfs_root.step.dependOn(install_libraries);

    // ** system zip - problematic to call in the way we need from zig.build
    // I know of no way to get the resulting zip file to strip the containing directory path when using addDirectoryArg.
    // Normally this is done by passing a relative path as the input folder to be archived - but we need to use zig's addDirectoryArg instead of just addArg with a string
    // If we don't use addDirectoryArg - the zig cache will return stale results despite the systemzip step depending on make_vfs_root.step, etc (why??)
    // addDirectoryArg seems only able to provide a full path to the system command - not the relative path we would need to strip the containing folder.
    // -j option of zip doesn't help as it strips all paths.
    // This isn't a great concern here - as we have a partially built tclsh and we would prefer to use the less platform-dependant 'zipfs mkzip' functionality provided therein anyway
    // But it would have been nice for debug/testing purposes to compare with a system zip
    // zipfs mkzip may be fine for our purposes but doesn't give us some of the potential customisability of a system zip command
    //
    const systemzip = b.addSystemCommand(&.{ "zip", "-r" });
    //systemzip.step.dependOn(&make_vfs_root.step);

    systemzip.setCwd(make_vfs_root.getDirectory());
    const out_zip = systemzip.addOutputFileArg("zipfs.zip");
    //systemzip.addDirectoryArg(tcl_library_path);
    systemzip.addArg("tcl_library");
    const install_systemzip = b.addInstallFileWithDir(out_zip, .prefix, "zipfs.zip");
    install_systemzip.step.dependOn(&systemzip.step);
    //b.getInstallStep().dependOn(&install_systemzip.step);

    // ** *** mkzip
    var mkzip_run: *std.Build.Step.Run = undefined;
    //mkzip_run.step.dependOn(&make_vfs_root.step); // ??????
    //mkzip_run.step.dependOn(install_libraries);
    if (target.result.os.tag == builtin.os.tag) {
        mkzip_run = b.addRunArtifact(tclsh_exe);
    } else {
        mkzip_run = b.addSystemCommand(&.{"tclsh90"});
    }
    common.scrubTclEnv(mkzip_run);
    mkzip_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
    mkzip_run.addFileArg(b.path("tools/zipfs_mkzip.tcl"));
    mkzip_run.addArg("-outfile");
    const out_mkzip = mkzip_run.addOutputFileArg("mkzipfs.zip");
    mkzip_run.addArg("-indir");
    mkzip_run.addDirectoryArg(tcl_library_path.dirname());
    mkzip_run.addArg("-strip");
    mkzip_run.addDirectoryArg(tcl_library_path.dirname());

    //mkzip_run.addArg(make_vfs_root.getDirectory());
    const install_mkzip = b.addInstallFileWithDir(out_mkzip, .prefix, "mkzipfs.zip");
    install_mkzip.step.dependOn(&mkzip_run.step);

    const make_zipfs = b.step("make-zipfs", "make zipfs and attach to executable");
    //make_zipfs.dependOn(&tclsh_exe.step);
    make_zipfs.dependOn(&install_mkzip.step);
    //make_zipfs.dependOn(&install_systemzip.step); //not really required
    // ** ***

    // ** *** *** mkimg
    var mkimg_run: *std.Build.Step.Run = undefined;
    if (target.result.os.tag == builtin.os.tag) {
        mkimg_run = b.addRunArtifact(tclsh_exe);
    } else {
        //require an existing tclsh90 - with zipfs support on the path for x-builds
        mkimg_run = b.addSystemCommand(&.{"tclsh90"});
    }
    common.scrubTclEnv(mkimg_run);
    mkimg_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
    mkimg_run.addFileArg(b.path("tools/zipfs_mkimg.tcl"));
    mkimg_run.addArg("-outfile");
    var out_mkimg: std.Build.LazyPath = undefined;
    if (target.result.os.tag == .windows) {
        out_mkimg = mkimg_run.addOutputFileArg("tclsh90szip.exe");
    } else {
        out_mkimg = mkimg_run.addOutputFileArg("tclsh90szip");
    }
    mkimg_run.addArg("-indir");
    mkimg_run.addDirectoryArg(tcl_library_path.dirname());
    mkimg_run.addArg("-strip");
    mkimg_run.addDirectoryArg(tcl_library_path.dirname());
    if (target.result.os.tag == .windows) {
        //we can just leave off the -infile argument to use the calling interp as the prepended file
    } else {
        mkimg_run.addArg("-infile");
        mkimg_run.addArtifactArg(tclsh_exe);
    }
    var install_mkimg: *std.Build.Step.InstallFile = undefined;
    if (target.result.os.tag == .windows) {
        install_mkimg = b.addInstallFileWithDir(out_mkimg, .prefix, "bin/tclsh90szip.exe");
    } else {
        install_mkimg = b.addInstallFileWithDir(out_mkimg, .prefix, "bin/tclsh90szip");
    }
    install_mkimg.step.dependOn(&mkimg_run.step);
    make_zipfs.dependOn(&install_mkimg.step);
    // ** *** ***

    // ** *** *** mkimg for the piperepl shell -> tclsh90sprzip(.exe)
    //Same attached-library wrap as tclsh90szip, but the prefix executable is the
    //patched shell, named explicitly via -infile (the stock wrap uses the calling
    //interp as its own prefix on windows).
    var mkimg_pr_run: *std.Build.Step.Run = undefined;
    if (target.result.os.tag == builtin.os.tag) {
        mkimg_pr_run = b.addRunArtifact(tclsh_exe);
    } else {
        //require an existing tclsh90 - with zipfs support on the path for x-builds
        mkimg_pr_run = b.addSystemCommand(&.{"tclsh90"});
    }
    common.scrubTclEnv(mkimg_pr_run);
    mkimg_pr_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
    mkimg_pr_run.addFileArg(b.path("tools/zipfs_mkimg.tcl"));
    mkimg_pr_run.addArg("-outfile");
    var out_mkimg_pr: std.Build.LazyPath = undefined;
    if (target.result.os.tag == .windows) {
        out_mkimg_pr = mkimg_pr_run.addOutputFileArg("tclsh90sprzip.exe");
    } else {
        out_mkimg_pr = mkimg_pr_run.addOutputFileArg("tclsh90sprzip");
    }
    mkimg_pr_run.addArg("-indir");
    mkimg_pr_run.addDirectoryArg(tcl_library_path.dirname());
    mkimg_pr_run.addArg("-strip");
    mkimg_pr_run.addDirectoryArg(tcl_library_path.dirname());
    mkimg_pr_run.addArg("-infile");
    mkimg_pr_run.addArtifactArg(tclsh_pr_exe);
    var install_mkimg_pr: *std.Build.Step.InstallFile = undefined;
    if (target.result.os.tag == .windows) {
        install_mkimg_pr = b.addInstallFileWithDir(out_mkimg_pr, .prefix, "bin/tclsh90sprzip.exe");
    } else {
        install_mkimg_pr = b.addInstallFileWithDir(out_mkimg_pr, .prefix, "bin/tclsh90sprzip");
    }
    install_mkimg_pr.step.dependOn(&mkimg_pr_run.step);
    make_zipfs.dependOn(&install_mkimg_pr.step);
    // ** *** ***

    //****************************

    const thread_build = try build_tclthread(tcl_source_folder, "../tclthread", b, target, optimize, finalstublib);
    const build_tclthread_step = b.step("build-tclthread", "build tcl thread library");
    build_tclthread_step.dependOn(&thread_build.lib.step);
    b.getInstallStep().dependOn(build_tclthread_step);

    //G-098: Tk loadable extension (windows target only for now). The build facts
    //are hoisted (optional) so the G-103 bi-family staging can consume them.
    var tk_build: ?TkBuild = null;
    if (target.result.os.tag == .windows) {
        tk_build = try build_tk(tcl_source_folder, "../tk9", b, target, optimize, finalstublib);
        const build_tk_step = b.step("build-tk", "build tk shared library (tcl9tk90.dll) + tk script library install");
        build_tk_step.dependOn(&tk_build.?.lib.step);
    }

    //if !ZIPFS_BUILD
    //install without zipfs
    //b.getInstallStep().dependOn(install_libraries);

    // ================== G-102 post-tclsh phases ==================
    //Tcl phases executed by the FRESHLY BUILT suite shell as build steps - Tcl stays
    //the tool exactly where a tclsh is guaranteed to exist because the suite just
    //built it. Formerly suite.tcl's post-build blocks; suite.tcl now drives these
    //via step names. Native-host builds only (the runs execute the built artifacts).
    if (target.result.os.tag == builtin.os.tag) {
        //-- smoke: shells respond with the expected patchlevel; the zip shell proves
        //the attached library (tzdata + autoload)
        const smoke_step = b.step("smoke", "smoke-test the built shells (patchlevel; zip: attached tzdata/autoload)");
        const smoke_static = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(smoke_static);
        smoke_static.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        smoke_static.has_side_effects = true;
        smoke_static.addFileArg(b.path("tools/suite_smoke.tcl"));
        smoke_static.addArgs(&.{ "-mode", "static", "-expect", tcl_h_patchlevel });
        smoke_static.step.dependOn(b.getInstallStep());
        smoke_step.dependOn(&smoke_static.step);
        const zipexe_name = if (target.result.os.tag == .windows) tclsh_static ++ "zip.exe" else tclsh_static ++ "zip";
        const smoke_zip = b.addSystemCommand(&.{b.pathJoin(&.{ b.install_path, "bin", zipexe_name })});
        common.scrubTclEnv(smoke_zip);
        smoke_zip.has_side_effects = true;
        smoke_zip.addFileArg(b.path("tools/suite_smoke.tcl"));
        smoke_zip.addArgs(&.{ "-mode", "zip", "-expect", tcl_h_patchlevel });
        smoke_zip.step.dependOn(&install_mkimg.step);
        smoke_step.dependOn(&smoke_zip.step);

        //-- tklib: pure-tcl but its installer is NOT a straight copy (module
        //exclusions + aggregating pkgIndex generation). Batch mode, packages only;
        //the -pkg-path is a cached output dir installed into the prefix.
        const tklib_ver = common.installerPackageVersion(b, "../tklib");
        const tklib_step = b.step("tklib", "install tklib via its own installer under the suite-built shell (+Tk smoke)");
        const tklib_run = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(tklib_run);
        tklib_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        //cached (non-side-effect) Runs spawn with stdout IGNORED - on windows the
        //child then has no stdout handle and tcl errors on any puts ('can not find
        //channel named "stdout"', critcl's logging). Capturing gives it a real pipe.
        _ = tklib_run.captureStdOut(.{});
        tklib_run.setCwd(b.path("../tklib"));
        tklib_run.addFileArg(b.path("../tklib/installer.tcl"));
        tklib_run.addArgs(&.{ "-no-gui", "-no-wait", "-no-apps", "-no-html", "-no-nroff", "-no-examples", "-pkg-path" });
        const tklib_out = tklib_run.addOutputDirectoryArg("tklib-pkg");
        const tklib_install = b.addInstallDirectory(.{
            .source_dir = tklib_out,
            .install_dir = .prefix,
            .install_subdir = b.fmt("lib/tklib{s}", .{tklib_ver}),
        });
        const tklib_smoke = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(tklib_smoke);
        tklib_smoke.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        tklib_smoke.has_side_effects = true;
        tklib_smoke.addFileArg(b.path("tools/pkg_smoke.tcl"));
        tklib_smoke.addArgs(&.{ "-gui", "1", "tooltip" });
        tklib_smoke.step.dependOn(&tklib_install.step);
        tklib_smoke.step.dependOn(b.getInstallStep()); //Tk dll + pkgIndex + tcl library
        tklib_step.dependOn(&tklib_smoke.step);

        //-- tcllib: same installer family (critcl DSL stubbed to no-ops - this is the
        //PURE-TCL side; the critcl-built tcllibc accelerators are the next step)
        const tcllib_ver = common.installerPackageVersion(b, "../tcllib");
        const tcllib_step = b.step("tcllib", "install tcllib (pure-tcl side) via its own installer under the suite-built shell (+smoke)");
        const tcllib_run = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(tcllib_run);
        tcllib_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        //cached (non-side-effect) Runs spawn with stdout IGNORED - on windows the
        //child then has no stdout handle and tcl errors on any puts ('can not find
        //channel named "stdout"', critcl's logging). Capturing gives it a real pipe.
        _ = tcllib_run.captureStdOut(.{});
        tcllib_run.setCwd(b.path("../tcllib"));
        tcllib_run.addFileArg(b.path("../tcllib/installer.tcl"));
        tcllib_run.addArgs(&.{ "-no-gui", "-no-wait", "-no-apps", "-no-html", "-no-nroff", "-no-examples", "-pkg-path" });
        const tcllib_out = tcllib_run.addOutputDirectoryArg("tcllib-pkg");
        const tcllib_install = b.addInstallDirectory(.{
            .source_dir = tcllib_out,
            .install_dir = .prefix,
            .install_subdir = b.fmt("lib/tcllib{s}", .{tcllib_ver}),
        });
        const tcllib_smoke = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(tcllib_smoke);
        tcllib_smoke.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        tcllib_smoke.has_side_effects = true;
        tcllib_smoke.addFileArg(b.path("tools/pkg_smoke.tcl"));
        tcllib_smoke.addArgs(&.{ "md5", "sha1", "cmdline" });
        tcllib_smoke.step.dependOn(&tcllib_install.step);
        tcllib_smoke.step.dependOn(b.getInstallStep());
        tcllib_step.dependOn(&tcllib_smoke.step);

        //-- tcllibc: tcllib's critcl accelerators, critcl driving zig cc (the
        //tracked critcl_zig.config; zig resolved from PATH with our own dir
        //prepended). sak.tcl's critcl target expects a tclkitsh on windows - this
        //replicates its underlying invocation directly, as suite.tcl did.
        const tcllibc_step = b.step("tcllibc", "build+install tcllibc (critcl accelerators, zig cc) under the suite-built shell (+accel smoke)");
        const critcl_run = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(critcl_run);
        critcl_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        //cached (non-side-effect) Runs spawn with stdout IGNORED - on windows the
        //child then has no stdout handle and tcl errors on any puts ('can not find
        //channel named "stdout"', critcl's logging). Capturing gives it a real pipe.
        _ = critcl_run.captureStdOut(.{});
        critcl_run.setCwd(b.path("../tcllib"));
        critcl_run.addFileArg(b.path("../critcl/main.tcl"));
        critcl_run.addArg("-config");
        critcl_run.addFileArg(b.path("critcl_zig.config"));
        //pin the build target to the config's explicit section: critcl otherwise
        //GUESSES its target by probing PATH for compilers - with a gcc visible the
        //config defaults engaged, but a scrubbed environment fell back to critcl's
        //builtin msvc 'cl' target and never used the zig cc settings (G-102 finding).
        critcl_run.addArgs(&.{ "-target", "win32-x86_64-zig" });
        critcl_run.addArg("-cache");
        _ = critcl_run.addOutputDirectoryArg("critcl-cache");
        critcl_run.addArg("-force");
        critcl_run.addArg("-libdir");
        const critcl_libout = critcl_run.addOutputDirectoryArg("critcl-lib");
        critcl_run.addArgs(&.{ "-pkg", "tcllibc" });
        for (common.tcllibCritclFiles(b, "../tcllib")) |cf| {
            critcl_run.addFileArg(b.path(b.pathJoin(&.{ "../tcllib/modules", cf })));
        }
        const zigdir = std.fs.path.dirname(b.graph.zig_exe) orelse ".";
        const inherited_path = b.graph.environ_map.get("PATH") orelse "";
        critcl_run.setEnvironmentVariable("PATH", b.fmt("{s}{c}{s}", .{ zigdir, std.fs.path.delimiter, inherited_path }));
        const tcllibc_install = b.addInstallDirectory(.{
            .source_dir = critcl_libout,
            .install_dir = .prefix,
            .install_subdir = "lib",
        });
        const tcllibc_smoke = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(tcllibc_smoke);
        tcllibc_smoke.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        tcllibc_smoke.has_side_effects = true;
        tcllibc_smoke.addFileArg(b.path("tools/pkg_smoke.tcl"));
        tcllibc_smoke.addArgs(&.{ "-accel", "md5", "tcllibc" });
        tcllibc_smoke.step.dependOn(&tcllibc_install.step);
        tcllibc_smoke.step.dependOn(&tcllib_install.step); //accel host packages come from tcllib
        tcllibc_smoke.step.dependOn(b.getInstallStep());
        tcllibc_step.dependOn(&tcllibc_smoke.step);

        const testreports_dir = common.replaceAll(b, b.pathJoin(&.{ b.install_path, "testreports" }), "\\", "/");

        // ================== G-103 runtime kit family ==================
        //PLAIN (stock shell + batteries), PUNK (piperepl-patched shell, gate
        //default-ON with TCLSH_PIPEREPL=0 opt-out, same batteries), PUNK-BI
        //(punk + the libraries we build: Tk dll + script lib, tklib). Working
        //names carry the dotted tcl patchlevel with punk-marked patched shells
        //(tclsh9.0.5.exe / tclsh9.0.5-punk.exe / tclsh9.0.5-punk-bi.exe - G-103
        //naming decision); -r<N> artifact copies are kit-family-artifacts' job.
        //
        //Attached-image layout (the make.tcl kit contract: what a future kit
        //build extracts and merges under its .vfs payload):
        //  tcl_library/   core script library (the C-level zipfs boot looks only
        //                 for /app/main.tcl and /app/tcl_library; no main.tcl -
        //                 stock fallthrough to the interactive shell)
        //  tcl9/<ver>/    tm modules (tm.tcl anchors at dirname of tcl_library)
        //  lib/<pkg>/     batteries with their installed-shape pkgIndexes
        //                 ($dir/../../bin dll references resolve to /app/bin)
        //  bin/<dll>      battery dlls (loaded from zipfs via copy-to-temp -
        //                 the characterized TIP-741 cleanup wart, goal Notes)
        //  lib/pkgIndex.tcl  one-line stock hook joining lib/ to the package
        //                 search: auto_path is [tcl_library, /app] and
        //                 tclPkgUnknown re-scans auto_path growth mid-scan (the
        //                 same mechanism tcllib's own top-level index uses)
        if (target.result.os.tag == .windows) {
            const family_step = b.step("kit-family", "assemble + verify the G-103 runtime kit family (plain/punk/punk-bi): self-contained batteries-attached shells -> <prefix>/family");
            const family_libext_pkgindex =
                \\#punkshell runtime kit family (G-103): stock package-index hook extending
                \\#the package search into the attached image's lib/ tree (tclPkgUnknown
                \\#re-scans auto_path growth mid-scan - the same mechanism tcllib's own
                \\#top-level pkgIndex uses). The batteries keep their installed-shape
                \\#indexes ($dir/../../bin dll references resolve to /app/bin).
                \\if {$dir ni $::auto_path} {lappend ::auto_path $dir}
                \\
            ;
            const tkb = tk_build.?; //windows target (checked just above)
            //default 2: r1 of every (9.0.5, variant) pair was PUBLISHED to punkbin
            //2026-07-22 and is immutable - subsequent assemblies (first content
            //change: tclvfs forTcl9/1.5.0) emit as r2 until r2 is itself published
            //and superseded. Bump this default whenever the current rev publishes.
            const familyrev = b.option(u32, "familyrev", "assembly revision N for the -r<N> family artifact names (kit-family-artifacts; default 2 - r1 published 2026-07-22)") orelse 2;
            //G-117 schema v1 identity options. origin = canonical artifact repo the
            //artifacts are BUILT FOR (not necessarily where they end up hosted -
            //mirrors preserve it). packager = declared identity, resolution chain
            //-Dpackager > env PUNKBIN_PACKAGER > building checkout's git identity >
            //"unrecorded" (declarative, not proof - signing is the verification layer).
            const originurl = b.option([]const u8, "originurl", "canonical artifact repo url the family artifacts are built FOR ('origin' field; default punkbin)") orelse "https://www.gitea1.intx.com.au/jn/punkbin";
            const projecturl = b.option([]const u8, "projecturl", "project url recorded in the artifact records ('project_url' field; default unrecorded)") orelse "unrecorded";
            const packager = blk: {
                if (b.option([]const u8, "packager", "declared packager identity for the artifact records (-Dpackager > env PUNKBIN_PACKAGER > git identity > unrecorded)")) |p| break :blk p;
                if (b.graph.environ_map.get("PUNKBIN_PACKAGER")) |p| {
                    if (p.len != 0) break :blk p;
                }
                var gc: u8 = undefined;
                const gname: ?[]const u8 = b.runAllowFail(&.{ "git", "config", "user.name" }, &gc, .ignore) catch null;
                if (gname != null and gc == 0) {
                    const nm = std.mem.trim(u8, gname.?, " \t\r\n");
                    if (nm.len != 0) {
                        const gmail: ?[]const u8 = b.runAllowFail(&.{ "git", "config", "user.email" }, &gc, .ignore) catch null;
                        if (gmail != null and gc == 0) {
                            const em = std.mem.trim(u8, gmail.?, " \t\r\n");
                            if (em.len != 0) break :blk b.fmt("{s} <{s}>", .{ nm, em });
                        }
                        break :blk nm;
                    }
                }
                break :blk "unrecorded";
            };

            const FamilyKit = struct {
                variant: []const u8,
                working_name: []const u8,
                prefix_exe: *std.Build.Step.Compile,
                tree: usize,
            };
            const family_kits = [_]FamilyKit{
                .{ .variant = "plain", .working_name = b.fmt("tclsh{s}.exe", .{tcl_h_patchlevel}), .prefix_exe = tclsh_exe, .tree = 0 },
                .{ .variant = "punk", .working_name = b.fmt("tclsh{s}-punk.exe", .{tcl_h_patchlevel}), .prefix_exe = tclsh_pr_exe, .tree = 0 },
                .{ .variant = "punk-bi", .working_name = b.fmt("tclsh{s}-punk-bi.exe", .{tcl_h_patchlevel}), .prefix_exe = tclsh_pr_exe, .tree = 1 },
            };

            //source checkout uuids (also consumed by kit-family-artifacts below)
            const uuid_tcl = common.manifestUuid(b, tcl_source_folder);
            const uuid_thread = common.manifestUuid(b, "../tclthread");
            const uuid_tclvfs = common.manifestUuid(b, "../tclvfs");
            const uuid_tk = common.manifestUuid(b, "../tk9");
            const uuid_tcllib = common.manifestUuid(b, "../tcllib");
            const uuid_tklib = common.manifestUuid(b, "../tklib");

            //G-117: per-member EMBEDDED artifact record (schema v1), staged into each
            //member's payload tree as base/punkbin-artifact.toml (namespaced so a
            //future G-025 kit-stamp file can coexist; the record survives make.tcl
            //kit wrapping, which overlays without clearing). Finished-binary facts
            //(sha1, size, built) stay SIDECAR-ONLY: embed-then-hash ordering, no
            //circularity - the sidecar + sha1sums.txt remain the integrity authority.
            //build_id is a uuid-shaped sha1 digest over stable identity inputs
            //(artifact name incl -r<N>, toolchain/optimize, patchlevel, the member's
            //source-checkout uuids) - deterministic so the zig cache holds across
            //configures; a correlation key, not an integrity key.
            var family_records: [family_kits.len][]const u8 = undefined;
            for (family_kits, 0..) |fk, ki| {
                const kbi = fk.tree == 1;
                const wroot = fk.working_name[0 .. fk.working_name.len - 4]; //strip ".exe" (windows branch)
                const artifact_name = b.fmt("{s}-r{d}.exe", .{ wroot, familyrev });
                const prov_seed = if (kbi)
                    b.fmt("tcl {s} thread {s} tclvfs {s} tcllib {s} tk {s} tklib {s}", .{ uuid_tcl, uuid_thread, uuid_tclvfs, uuid_tcllib, uuid_tk, uuid_tklib })
                else
                    b.fmt("tcl {s} thread {s} tclvfs {s} tcllib {s}", .{ uuid_tcl, uuid_thread, uuid_tclvfs, uuid_tcllib });
                var idigest: [20]u8 = undefined;
                std.crypto.hash.Sha1.hash(b.fmt("punkbin-artifact|{s}|zig {s}|{s}|tcl{s}|{s}", .{ artifact_name, builtin.zig_version_string, @tagName(optimize), tcl_h_patchlevel, prov_seed }), &idigest, .{});
                const ihex = std.fmt.bytesToHex(idigest, .lower);
                const build_id = b.fmt("{s}-{s}-{s}-{s}-{s}", .{ ihex[0..8], ihex[8..12], ihex[12..16], ihex[16..20], ihex[20..32] });
                const batteries = if (kbi)
                    b.fmt("[\"Thread {s}\", \"vfs {s}\", \"tcllib {s}\", \"tcllibc {s}\", \"Tk {s}\", \"tklib {s}\"]", .{ thread_build.version, tclvfs_info.dotversion, tcllib_ver, tcllib_ver, tkb.patchlevel, tklib_ver })
                else
                    b.fmt("[\"Thread {s}\", \"vfs {s}\", \"tcllib {s}\", \"tcllibc {s}\"]", .{ thread_build.version, tclvfs_info.dotversion, tcllib_ver, tcllib_ver });
                const piperepl_block: []const u8 = if (std.mem.eql(u8, fk.variant, "plain"))
                    "piperepl = false"
                else
                    "piperepl = true\npiperepl_default = \"on\"\npiperepl_opt_out = \"TCLSH_PIPEREPL=0\"";
                const prov_lines = if (kbi)
                    b.fmt("tcl_checkout = \"{s}\"\nthread_checkout = \"{s}\"\ntclvfs_checkout = \"{s}\"\ntk_checkout = \"{s}\"\ntcllib_checkout = \"{s}\"\ntklib_checkout = \"{s}\"", .{ uuid_tcl, uuid_thread, uuid_tclvfs, uuid_tk, uuid_tcllib, uuid_tklib })
                else
                    b.fmt("tcl_checkout = \"{s}\"\nthread_checkout = \"{s}\"\ntclvfs_checkout = \"{s}\"\ntcllib_checkout = \"{s}\"", .{ uuid_tcl, uuid_thread, uuid_tclvfs, uuid_tcllib });
                family_records[ki] = b.fmt(
                    \\#punkshell runtime artifact metadata - EMBEDDED copy (G-117 schema v1),
                    \\#written at kit-family staging. Finished-binary facts (sha1, size, built)
                    \\#live only in the sidecar toml + sha1sums.txt, which remain the integrity
                    \\#authority; this copy makes a stray or renamed runtime self-describing.
                    \\schema = 1
                    \\
                    \\[artifact]
                    \\name = "{s}"
                    \\class = "runtime"
                    \\variant = "{s}"
                    \\working_name = "{s}"
                    \\revision = {d}
                    \\target = "win32-x86_64"
                    \\#build_id: offline correlation key re-joining a renamed copy to its record;
                    \\#identical in embedded and sidecar copies. Uuid-shaped digest of stable
                    \\#identity inputs (deterministic) - not an integrity key.
                    \\build_id = "{s}"
                    \\#origin: canonical artifact repo this artifact was BUILT FOR - not
                    \\#necessarily where it is hosted; mirrors preserve it.
                    \\origin = "{s}"
                    \\#packager: declared identity, not proof - signing (minisign sidecars)
                    \\#is the verification layer.
                    \\packager = "{s}"
                    \\project = "punkshell"
                    \\project_url = "{s}"
                    \\#license: summary for the distributed artifact; component license texts
                    \\#ride inside the attached image (tcl_library/license.terms etc).
                    \\license = "TCL"
                    \\build_host_platform = "win32-x86_64"
                    \\
                    \\[runtime]
                    \\tcl_patchlevel = "{s}"
                    \\{s}
                    \\attached_batteries = {s}
                    \\
                    \\[provenance]
                    \\suite = "suite_tcl90"
                    \\toolchain = "zig {s}"
                    \\optimize = "{s}"
                    \\{s}
                    \\
                , .{ artifact_name, fk.variant, fk.working_name, familyrev, build_id, originurl, packager, projecturl, tcl_h_patchlevel, piperepl_block, batteries, builtin.zig_version_string, @tagName(optimize), prov_lines });
            }

            var family_tree_base: [family_kits.len]std.Build.LazyPath = undefined;
            for (family_kits, 0..) |fk, ki| { //per-member payload tree: shared content + the member's embedded record
                const famwf = b.addWriteFiles();
                //core script library at the boot position (tzdata/encoding ride
                //inside the source library tree), dde/registry dlls inside
                const fam_tcl_library = famwf.addCopyDirectory(b.path(tcl_source_folder ++ "/library"), "base/tcl_library", .{});
                _ = famwf.addCopyFile(b.path(tcl_source_folder ++ "/library/manifest.txt"), "base/tcl_library/pkgIndex.tcl");
                _ = famwf.addCopyFile(install_dde_dll.artifact.getEmittedBin(), "base/tcl_library/dde/" ++ dde_dll_file);
                _ = famwf.addCopyFile(reg_dll.getEmittedBin(), "base/tcl_library/registry/" ++ reg_dll_file);
                //tm modules (same set the prefix install carries)
                inline for (tm_installs) |tmi| {
                    _ = famwf.addCopyFile(b.path(tcl_source_folder ++ tmi.src), "base/tcl9/" ++ tcl_dot_version ++ "/" ++ tmi.tm);
                }
                //package-search hook for the lib/ tree
                _ = famwf.add("base/lib/pkgIndex.tcl", family_libext_pkgindex);
                //G-117 embedded artifact record (per-member; see the record block above)
                _ = famwf.add("base/punkbin-artifact.toml", family_records[ki]);
                //batteries (installed shape)
                try tclvfs_shared.familyadd_tclvfs_package("../tclvfs", b, famwf, b.fmt("base/lib/vfs{s}", .{tclvfs_info.dotversion}), tclvfs_compile);
                _ = famwf.addCopyFile(thread_build.pkgidx, b.fmt("base/lib/thread{s}/pkgIndex.tcl", .{thread_build.version}));
                _ = famwf.addCopyFile(thread_build.lib.getEmittedBin(), b.fmt("base/bin/{s}", .{thread_build.dll_file}));
                _ = famwf.addCopyDirectory(tcllib_out, b.fmt("base/lib/tcllib{s}", .{tcllib_ver}), .{});
                _ = famwf.addCopyDirectory(critcl_libout, "base/lib", .{}); //carries tcllibc/
                if (fk.tree == 1) {
                    _ = famwf.addCopyDirectory(b.path("../tk9/library"), b.fmt("base/lib/{s}", .{tkb.libdir}), .{});
                    _ = famwf.addCopyFile(tkb.pkgidx, b.fmt("base/lib/{s}/pkgIndex.tcl", .{tkb.libdir}));
                    _ = famwf.addCopyFile(tkb.lib.getEmittedBin(), b.fmt("base/bin/{s}", .{tkb.dll_file}));
                    _ = famwf.addCopyDirectory(tklib_out, b.fmt("base/lib/tklib{s}", .{tklib_ver}), .{});
                }
                family_tree_base[ki] = fam_tcl_library.dirname();
            }
            var family_checks: [family_kits.len]*std.Build.Step = undefined;
            var family_installed: [family_kits.len][]const u8 = undefined;
            for (family_kits, 0..) |fk, ki| {
                const wrap = b.addRunArtifact(tclsh_exe);
                common.scrubTclEnv(wrap);
                wrap.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
                wrap.addFileArg(b.path("tools/zipfs_mkimg.tcl"));
                wrap.addArg("-outfile");
                const wrapped = wrap.addOutputFileArg(fk.working_name);
                wrap.addArg("-indir");
                wrap.addDirectoryArg(family_tree_base[ki]);
                wrap.addArg("-strip");
                wrap.addDirectoryArg(family_tree_base[ki]);
                wrap.addArg("-infile");
                wrap.addArtifactArg(fk.prefix_exe);
                const inst = b.addInstallFileWithDir(wrapped, .prefix, b.fmt("family/{s}", .{fk.working_name}));
                inst.step.dependOn(&wrap.step);
                const installed_path = common.replaceAll(b, b.pathJoin(&.{ b.install_path, "family", fk.working_name }), "\\", "/");
                family_installed[ki] = installed_path;
                //self-containment verification: the tool copies the kit alone into
                //a scratch dir and probes from there with a scrubbed environment
                //(no external Tcl visible - see tools/family_check.tcl)
                const check = b.addRunArtifact(tclsh_exe);
                common.scrubTclEnv(check);
                check.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
                check.has_side_effects = true;
                check.addFileArg(b.path("tools/family_check.tcl"));
                check.addArgs(&.{ "-exe", installed_path, "-variant", fk.variant, "-expectpatch", tcl_h_patchlevel });
                check.addArgs(&.{ "-thread", thread_build.version, "-vfs", tclvfs_info.dotversion, "-tcllib", tcllib_ver });
                if (std.mem.eql(u8, fk.variant, "punk-bi")) {
                    check.addArgs(&.{ "-tk", tkb.patchlevel, "-tklib", tklib_ver });
                }
                check.step.dependOn(&inst.step);
                family_checks[ki] = &check.step;
                family_step.dependOn(&check.step);
            }

            //-- kit-family-artifacts: punkbin-layout emission (-r<N> immutable
            //artifact names + per-artifact toml metadata + sha1sums), run UNDER
            //THE PLAIN FAMILY KIT itself - every emission doubles as a proof the
            //family runtime executes real tooling from its attached batteries.
            //Depends on the checks: only verified kits get artifact records.
            //Publication to the real punkbin repo stays a deliberate user step.
            //(familyrev + the schema v1 identity options and checkout uuids are
            //declared above with the family staging - the embedded records need them)
            const family_artifacts_step = b.step("kit-family-artifacts", "emit punkbin-layout artifact copies (-r<N>) + toml metadata + sha1sums for the verified family kits -> <prefix>/family/punkbin/<target>");
            const artifacts_outdir = common.replaceAll(b, b.pathJoin(&.{ b.install_path, "family", "punkbin", "win32-x86_64" }), "\\", "/");
            const emit = b.addSystemCommand(&.{family_installed[0]});
            common.scrubTclEnv(emit);
            emit.has_side_effects = true;
            emit.addFileArg(b.path("tools/family_artifacts.tcl"));
            emit.addArgs(&.{ "-outdir", artifacts_outdir, "-rev", b.fmt("{d}", .{familyrev}), "-target", "win32-x86_64" });
            emit.addArgs(&.{ "-suite", "suite_tcl90", "-tclpatch", tcl_h_patchlevel, "-zig", builtin.zig_version_string, "-optimize", @tagName(optimize) });
            emit.addArgs(&.{ "-components", b.fmt("Thread {s} vfs {s} tcllib {s} tcllibc {s}", .{ thread_build.version, tclvfs_info.dotversion, tcllib_ver, tcllib_ver }) });
            emit.addArgs(&.{ "-bicomponents", b.fmt("Tk {s} tklib {s}", .{ tkb.patchlevel, tklib_ver }) });
            emit.addArgs(&.{ "-provenance", b.fmt("tcl {s} thread {s} tclvfs {s} tk {s} tcllib {s} tklib {s}", .{ uuid_tcl, uuid_thread, uuid_tclvfs, uuid_tk, uuid_tcllib, uuid_tklib }) });
            emit.addArgs(&.{ "-testreports", testreports_dir });
            emit.addArgs(&.{ "-kits", b.fmt("plain {{{s}}} punk {{{s}}} punk-bi {{{s}}}", .{ family_installed[0], family_installed[1], family_installed[2] }) });
            for (family_checks) |cs| emit.step.dependOn(cs);
            family_artifacts_step.dependOn(&emit.step);
        }
        // ==================

        //-- test-gate: the core testsuite under the built shell, gated on parsed
        //totals vs the tracked dispositioned baseline (all.tcl's exit code lies)
        const gate_step = b.step("test-gate", "tcl core testsuite under the built shell, gated on parsed totals vs expected_test_failures.txt");
        const testargs_opt = b.option([]const u8, "testargs", "extra tcltest args for test-gate (e.g -file http.test)") orelse "";
        const gate_run = b.addRunArtifact(tclsh_exe);
        common.scrubTclEnv(gate_run);
        gate_run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
        gate_run.has_side_effects = true;
        gate_run.addFileArg(b.path("tools/test_gate.tcl"));
        gate_run.addArgs(&.{ "-library", "tclcore" });
        gate_run.addArg("-testsdir");
        gate_run.addArg(common.replaceAll(b, b.pathFromRoot(tcl_source_folder ++ "/tests"), "\\", "/"));
        gate_run.addArg("-baseline");
        gate_run.addFileArg(b.path("expected_test_failures.txt"));
        gate_run.addArg("-logfile");
        gate_run.addArg(common.replaceAll(b, b.pathFromRoot("../tcltest.log"), "\\", "/"));
        gate_run.addArg("-summaryfile");
        gate_run.addArg(b.fmt("{s}/tclcore.summary", .{testreports_dir}));
        if (testargs_opt.len != 0) {
            gate_run.addArgs(&.{ "-testargs", testargs_opt });
        }
        gate_run.step.dependOn(b.getInstallStep());
        gate_step.dependOn(&gate_run.step);

        //-- per-library testsuites (G-107): the external libraries the suite builds
        //and ships run their own testsuites under the suite-built shell, with a
        //per-library policy tier resolved at invocation (no recipe edits needed):
        //  gate    parsed totals diffed against the tracked dispositioned baseline
        //          (core-gate semantics; default for the small load-bearing libs)
        //  record  run must complete and emit report artifacts under
        //          <prefix>/testreports/ (evidence for the exact zig-built
        //          combinations nobody upstream tests); failures recorded, not fatal
        //  skip    named step becomes a no-op (composite tuning)
        //Override per-library: -Dtestpolicy-<lib>=gate|record|skip. Per-library
        //driver/tcltest args: -Dtestargs-<lib>="..." (e.g '-notfile x.test' to
        //disposition a problem file; recorded in the evidence summary).
        //'test-libraries' runs the default set (thread tclvfs tcllib tklib). tk's
        //full suite is deliberately OUTSIDE it: opt-in step 'test-tk' (needs an
        //interactive desktop, maps real windows, runs tens of minutes; intended
        //before PUBLISHING bi-family artifacts, not on every build).
        //NOTE zig runs independent steps concurrently - for gate determinism of
        //timing-sensitive suites drive combined test invocations with -j1
        //(suite.tcl's test action does).
        const LibSuite = struct {
            name: []const u8, //step suffix, policy/testargs option suffix, report basename
            testsdir: []const u8, //run cwd (from build root)
            driver: []const u8, //driver script, relative to testsdir
            default_policy: []const u8,
            baseline: []const u8, //tracked baseline filename ("" = none tracked yet)
            default_notfiles: []const u8, //default driver -notfile exclusions ("" = none)
            deps: []const *std.Build.Step, //beyond the top-level install step
        };
        const thread_test_deps = [_]*std.Build.Step{install_libraries};
        const tclvfs_test_deps = [_]*std.Build.Step{install_libraries};
        const tcllib_test_deps = [_]*std.Build.Step{ install_libraries, &tcllib_install.step, &tcllibc_install.step };
        const tklib_test_deps = [_]*std.Build.Step{ install_libraries, &tklib_install.step, &tcllib_install.step };
        const tk_test_deps = [_]*std.Build.Step{install_libraries};
        const lib_suites = [_]LibSuite{
            //thread's testsuite requires the tree's exact version - the recipe derives
            //the installed package version from the same tree (build_tclthread).
            .{ .name = "thread", .testsdir = "../tclthread/tests", .driver = "all.tcl", .default_policy = "gate", .baseline = "expected_test_failures_thread.txt", .default_notfiles = "", .deps = &thread_test_deps },
            .{ .name = "tclvfs", .testsdir = "../tclvfs/tests", .driver = "all.tcl", .default_policy = "gate", .baseline = "expected_test_failures_tclvfs.txt", .default_notfiles = "", .deps = &tclvfs_test_deps },
            //tcllib via its own support/devel/all.tcl (sak's underlying driver -
            //standard aggregate totals, per-file child interps). The installed
            //tcllibc is on the shell's package path, so accelerator-aware suites
            //engage the critcl accelerators ('E tcllibc <v>' markers in the log) -
            //the single highest-value run here: zig-built accelerators against a
            //static tclsh is a combination nobody upstream tests.
            .{ .name = "tcllib", .testsdir = "../tcllib", .driver = "support/devel/all.tcl", .default_policy = "record", .baseline = "", .default_notfiles = "", .deps = &tcllib_test_deps },
            .{ .name = "tklib", .testsdir = "../tklib", .driver = "support/devel/all.tcl", .default_policy = "record", .baseline = "", .default_notfiles = "", .deps = &tklib_test_deps },
            //tk: the native-dialog suites (winDialog 72 cases, winMsgbox 19) are
            //excluded by default - their message-injection automation does not
            //drive the real OS dialogs under the batch/suite-built shell, so each
            //case blocks waiting on a human (the census cannot complete unattended
            //with them in). Re-include for a manual interactive run with
            //-Dtestnotfiles-tk="" (then a human dismisses each dialog).
            .{ .name = "tk", .testsdir = "../tk9/tests", .driver = "all.tcl", .default_policy = "record", .baseline = "", .default_notfiles = "winDialog.test winMsgbox.test", .deps = &tk_test_deps },
        };
        const libtests_step = b.step("test-libraries", "library testsuites under the built shell per policy tier (default: thread+tclvfs gate, tcllib+tklib record; tk excluded - see test-tk)");
        for (lib_suites) |ls| {
            const policy = b.option([]const u8, b.fmt("testpolicy-{s}", .{ls.name}), b.fmt("{s} testsuite policy: gate|record|skip (default {s})", .{ ls.name, ls.default_policy })) orelse ls.default_policy;
            const lib_testargs = b.option([]const u8, b.fmt("testargs-{s}", .{ls.name}), b.fmt("extra tcltest/driver args for the {s} testsuite", .{ls.name})) orelse "";
            const lib_notfiles = b.option([]const u8, b.fmt("testnotfiles-{s}", .{ls.name}), b.fmt("test-file glob patterns excluded from the {s} run (default \"{s}\")", .{ ls.name, ls.default_notfiles })) orelse ls.default_notfiles;
            const is_tk = std.mem.eql(u8, ls.name, "tk");
            const step = b.step(b.fmt("test-{s}", .{ls.name}), b.fmt("{s} testsuite under the built shell (policy: {s})", .{ ls.name, policy }));
            if (!is_tk) libtests_step.dependOn(step);
            if (std.mem.eql(u8, policy, "skip")) continue;
            if (!std.mem.eql(u8, policy, "gate") and !std.mem.eql(u8, policy, "record")) {
                std.debug.panic("-Dtestpolicy-{s}: unknown policy '{s}' (expected gate|record|skip)", .{ ls.name, policy });
            }
            const run = b.addRunArtifact(tclsh_exe);
            common.scrubTclEnv(run);
            run.setEnvironmentVariable("TCL_LIBRARY", tcl_library_src);
            run.has_side_effects = true;
            run.addFileArg(b.path("tools/test_gate.tcl"));
            run.addArgs(&.{ "-library", ls.name, "-mode", policy });
            run.addArg("-testsdir");
            run.addArg(common.replaceAll(b, b.pathFromRoot(ls.testsdir), "\\", "/"));
            run.addArgs(&.{ "-driver", ls.driver });
            if (std.mem.eql(u8, policy, "gate")) {
                run.addArg("-baseline");
                if (ls.baseline.len != 0) {
                    run.addFileArg(b.path(ls.baseline));
                } else {
                    //no tracked baseline yet: pass the conventional name so the
                    //engine's missing-baseline message names the file to create
                    run.addArg(common.replaceAll(b, b.pathFromRoot(b.fmt("expected_test_failures_{s}.txt", .{ls.name})), "\\", "/"));
                }
            }
            run.addArg("-logfile");
            run.addArg(b.fmt("{s}/{s}.log", .{ testreports_dir, ls.name }));
            run.addArg("-summaryfile");
            run.addArg(b.fmt("{s}/{s}.summary", .{ testreports_dir, ls.name }));
            if (lib_testargs.len != 0) {
                run.addArgs(&.{ "-testargs", lib_testargs });
            }
            if (lib_notfiles.len != 0) {
                run.addArgs(&.{ "-notfiles", lib_notfiles });
            }
            run.step.dependOn(b.getInstallStep());
            for (ls.deps) |dep| run.step.dependOn(dep);
            step.dependOn(&run.step);
        }
    }
    // ==================
}

//G-102 bootstrap mode: registered when this recipe is invoked from the TRACKED suite
//directory (see the mode note at the top of build()). The stage layout produced here
//is identical to suite.tcl's fossil staging, so both flows share the staged
//invocation - and the stage dir derives from THIS suite folder's name, preserving
//the copy-and-tweak isolation property (a copied suite stages into _build/<copy>).
fn bootstrapMode(b: *std.Build) !void {
    //default ReleaseFast for suite.tcl parity (standardOptimizeOption would default
    //Debug; the suite's runtimes are release artifacts)
    const optimize = b.option(std.builtin.OptimizeMode, "optimize", "optimize mode forwarded to the staged build (default ReleaseFast)") orelse .ReleaseFast;
    const suite_dirname = std.fs.path.basename(b.pathFromRoot(""));
    const stage_rel = b.pathJoin(&.{ "..", "_build", suite_dirname });

    const stage_tool = b.addExecutable(.{
        .name = "stagetree",
        .root_module = b.createModule(.{
            .root_source_file = b.path("tools/stagetree.zig"),
            .target = b.graph.host,
        }),
    });

    const stage_step = b.step("stage", "materialize pinned sources (build.zig.zon) + recipe copy into ../_build/<suite> (existing fossil/git checkouts left untouched)");

    //dependency name (build.zig.zon) -> stage dir (the recipe-coupled dir names
    //documented in sources.config)
    const source_dirs = [_][2][]const u8{
        .{ "tcl", "tcl905" },
        .{ "tclthread", "tclthread" },
        .{ "tclvfs", "tclvfs" },
        .{ "tk", "tk9" },
        .{ "tklib", "tklib" },
        .{ "tcllib", "tcllib" },
        .{ "critcl", "critcl" },
    };
    var deps_pending = false;
    for (source_dirs) |sd| {
        const dep_name = sd[0];
        const destdir = sd[1];
        const dest_from_root = b.pathJoin(&.{ stage_rel, destdir });
        //an existing fossil/git checkout is owned by the suite.tcl dev flow: skip the
        //whole dependency so nothing is fetched for it (stagetree guards again at
        //make time - this check just avoids needless fetches).
        if (common.pathExists(b, b.pathJoin(&.{ dest_from_root, ".fslckout" })) or
            common.pathExists(b, b.pathJoin(&.{ dest_from_root, "_FOSSIL_" })) or
            common.pathExists(b, b.pathJoin(&.{ dest_from_root, ".git" })))
        {
            continue;
        }
        if (b.lazyDependency(dep_name, .{})) |dep| {
            const run = b.addRunArtifact(stage_tool);
            run.setName(b.fmt("stage {s}", .{destdir}));
            run.has_side_effects = true;
            //the dependency's content-addressed cache path doubles as the pin key:
            //a manifest pin bump changes it, invalidating the materialized copy
            const dep_root = dep.path("").getPath(b);
            run.addArgs(&.{ "-key", dep_root, "-src", dep_root, "-dest", b.pathFromRoot(dest_from_root) });
            stage_step.dependOn(&run.step);
        } else {
            deps_pending = true;
        }
    }
    if (deps_pending) return; //zig fetches the lazy deps, then re-runs configure

    //recipe copy -> <stage>/build (the same item list suite.tcl stages; per-item
    //replace every run - recipe files are small tracked working files, no pin)
    const recipe_items = [_][]const u8{
        "build905.zig",
        "build_common.zig",
        "build_libtommath",
        "build_zlib",
        "build_tclvfs",
        "build_tclthread",
        "build_tk",
        "critcl_zig.config",
        "expected_test_failures.txt",
        "expected_test_failures_thread.txt",
        "expected_test_failures_tclvfs.txt",
        "patches",
        "src",
        "tools",
    };
    for (recipe_items) |item| {
        const run = b.addRunArtifact(stage_tool);
        run.setName(b.fmt("stage recipe {s}", .{item}));
        run.has_side_effects = true;
        run.addArgs(&.{ "-key", "-", "-src", b.pathFromRoot(item), "-dest", b.pathFromRoot(b.pathJoin(&.{ stage_rel, "build", item })) });
        stage_step.dependOn(&run.step);
    }

    //bootstrap: stage, then drive the staged recipe - the same nested invocation
    //suite.tcl performs after its fossil staging. Per-zig-version cache dir (object
    //caches must never be shared across zig versions - user-confirmed hazard), same
    //name suite.tcl derives so both flows share the staged cache.
    const steps_opt = b.option([]const []const u8, "steps", "steps for the staged build (repeat the flag; default: install install-libraries make-zipfs smoke tklib tcllib tcllibc kit-family kit-family-artifacts - the full pipeline short of test-gate)") orelse @as([]const []const u8, &.{ "install", "install-libraries", "make-zipfs", "smoke", "tklib", "tcllib", "tcllibc", "kit-family", "kit-family-artifacts" });
    var cachever: []const u8 = builtin.zig_version_string;
    cachever = common.replaceAll(b, cachever, "+", "_");
    cachever = common.replaceAll(b, cachever, "/", "_");
    cachever = common.replaceAll(b, cachever, ":", "_");
    //forward-slash paths throughout (suite.tcl parity): the prefix flows into
    //-D macros like TCL_PACKAGE_PATH as a C string literal - backslashes there are
    //parsed as escape sequences and break the compile
    const nested = b.addSystemCommand(&.{
        b.graph.zig_exe,
        "build",
        "--build-file",
        common.replaceAll(b, b.pathFromRoot(b.pathJoin(&.{ stage_rel, "build", "build905.zig" })), "\\", "/"),
        "--cache-dir",
        common.replaceAll(b, b.pathFromRoot(b.pathJoin(&.{ stage_rel, "build", b.fmt(".zig-cache-{s}", .{cachever}) })), "\\", "/"),
        "--prefix",
        common.replaceAll(b, b.pathFromRoot(b.pathJoin(&.{ stage_rel, "out" })), "\\", "/"),
        b.fmt("-Doptimize={s}", .{@tagName(optimize)}),
    });
    for (steps_opt) |s| nested.addArg(s);
    nested.setName("staged build (nested zig build)");
    nested.has_side_effects = true;
    //cwd = staged build dir (suite.tcl parity): parts of the recipe (e.g build_zlib's
    //source iteration) resolve source paths relative to the process cwd, not the
    //build root
    nested.setCwd(.{ .cwd_relative = b.pathFromRoot(b.pathJoin(&.{ stage_rel, "build" })) });
    //hermetic child shells (parity with suite.tcl): steps in the staged graph run
    //the freshly built tclsh, which must not see the user's machine-level tcl env
    for ([_][]const u8{ "TCLLIBPATH", "TCL_LIBRARY", "TK_LIBRARY" }) |ev| {
        nested.removeEnvironmentVariable(ev);
    }
    nested.step.dependOn(stage_step);
    const bootstrap_step = b.step("bootstrap", "stage + run the staged recipe end-to-end (no pre-existing tclsh required)");
    bootstrap_step.dependOn(&nested.step);
}