diff --git a/src/buildsuites/suite_tcl90/build.zig b/src/buildsuites/suite_tcl90/build.zig
new file mode 100644
index 00000000..588b9a34
--- /dev/null
+++ b/src/buildsuites/suite_tcl90/build.zig
@@ -0,0 +1,7 @@
+//build.zig - default-entry shim so plain 'zig build <step>' works from this
+//directory (the bootstrap-flow invocations in the README). The recipe itself
+//lives in build905.zig - a deliberately VERSIONED name (the staged flows invoke
+//it explicitly via --build-file, and a future suite may carry more than one
+//recipe file). build.zig.zon beside this file serves both entry points.
+const recipe = @import("build905.zig");
+pub const build = recipe.build;
diff --git a/src/buildsuites/suite_tcl90/build905.zig b/src/buildsuites/suite_tcl90/build905.zig
index 1ed63792..ce47d15f 100644
--- a/src/buildsuites/suite_tcl90/build905.zig
+++ b/src/buildsuites/suite_tcl90/build905.zig
@@ -44,20 +44,17 @@ var static_build: bool = true;
 //}
 
 comptime {
-    //const required_zig = "0.14.0-dev.300";
-    const required_zig = "0.13.0-dev.8";
+    //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 =
-            \\Sorry, it looks like your version of zig is too old. :-(
-            \\
-            \\punk tcl requires development build {}
-            \\
-            \\Please download a development ("master") build from
-            \\
-            \\https://ziglang.org/download/
-            \\
+            \\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}));
@@ -2298,6 +2295,11 @@ pub fn build(b: *std.Build) !void {
         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");
diff --git a/src/buildsuites/suite_tcl90/critcl_zig.config b/src/buildsuites/suite_tcl90/critcl_zig.config
index 12af67b5..e38ce851 100644
--- a/src/buildsuites/suite_tcl90/critcl_zig.config
+++ b/src/buildsuites/suite_tcl90/critcl_zig.config
@@ -1,25 +1,34 @@
-# suite_tcl90 critcl configuration: zig cc as the C toolchain (G-098).
-# Overrides critcl's gcc-style defaults; 'zig' is resolved from PATH - the suite
-# driver prepends the pinned bin/tools zig dir for the critcl invocation.
-# Target is the native windows-gnu triple (matches the suite's tcl runtime ABI).
+# suite_tcl90 critcl configuration: zig cc as the C toolchain (G-098, G-102).
+# 'zig' is resolved from PATH - the suite recipe prepends the pinned bin/tools zig
+# dir for the critcl invocation. Target is the native windows-gnu triple (matches
+# the suite's tcl runtime ABI).
+#
+# The settings live under an EXPLICIT target, win32-x86_64-zig, and the recipe
+# invokes critcl with '-target win32-x86_64-zig': critcl otherwise chooses its
+# build target by PROBING the environment for compilers, which made the selection
+# depend on what happened to be on PATH (a visible gcc landed on the config
+# defaults; a scrubbed environment fell back to critcl's builtin msvc 'cl'
+# target and never used these settings - G-102 finding).
 
 platform        win32-x86_64
-compile         zig cc -target x86_64-windows-gnu -c -fPIC
-version         zig version
-link            zig cc -target x86_64-windows-gnu -shared
-include         -I
-libinclude      -L
-object          .o
-output          -o [list $outfile]
-optimize        -O2
-noassert        -DNDEBUG
-tclstubs        -DUSE_TCL_STUBS
-tkstubs         -DUSE_TK_STUBS
-debug_symbols   -g
-strip           -Wl,-s
-link_debug
-link_release
-embed_manifest
-ldoutput
-link_preload
-sharedlibext    .dll
+
+win32-x86_64-zig  platform        win32-x86_64
+win32-x86_64-zig  compile         zig cc -target x86_64-windows-gnu -c -fPIC
+win32-x86_64-zig  version         zig version
+win32-x86_64-zig  link            zig cc -target x86_64-windows-gnu -shared
+win32-x86_64-zig  include         -I
+win32-x86_64-zig  libinclude      -L
+win32-x86_64-zig  object          .o
+win32-x86_64-zig  output          -o [list $outfile]
+win32-x86_64-zig  optimize        -O2
+win32-x86_64-zig  noassert        -DNDEBUG
+win32-x86_64-zig  tclstubs        -DUSE_TCL_STUBS
+win32-x86_64-zig  tkstubs         -DUSE_TK_STUBS
+win32-x86_64-zig  debug_symbols   -g
+win32-x86_64-zig  strip           -Wl,-s
+win32-x86_64-zig  link_debug
+win32-x86_64-zig  link_release
+win32-x86_64-zig  embed_manifest
+win32-x86_64-zig  ldoutput
+win32-x86_64-zig  link_preload
+win32-x86_64-zig  sharedlibext    .dll