diff --git a/scripts/check-examples.sh b/scripts/check-examples.sh
index f866248e8..7cb16520d 100755
--- a/scripts/check-examples.sh
+++ b/scripts/check-examples.sh
@@ -151,7 +151,10 @@ echo "ok    app-only (failed as expected)"
 fixtures="scripts/fixtures/build-api"
 for id in fixture_both fixture_native; do
   mkdir -p "$work/$id"
-  cp "$fixtures"/plugin/{build.zig,build.zig.zon,plugin.zig,lib.zig,lib.c} "$work/$id/"
+  cp "$fixtures"/plugin/{build.zig,build.zig.zon,plugin.zig} "$work/$id/"
+  # The C dependency's symbol carries the id, so dropping either package's C source fails the link.
+  sed "s/@ID@/$id/g" "$fixtures/plugin/lib.zig.tmpl" > "$work/$id/lib.zig"
+  sed "s/@ID@/$id/g" "$fixtures/plugin/lib.c.tmpl" > "$work/$id/lib.c"
   sed "s/@ID@/$id/g" "$fixtures/plugin/plugin.zig.zon.tmpl" > "$work/$id/plugin.zig.zon"
   (cd "$work/$id" && zig fetch --save=fizzy "$sdk_tarball" >/dev/null)
 done
diff --git a/scripts/fixtures/build-api/plugin/lib.c b/scripts/fixtures/build-api/plugin/lib.c
deleted file mode 100644
index 87c510882..000000000
--- a/scripts/fixtures/build-api/plugin/lib.c
+++ /dev/null
@@ -1,4 +0,0 @@
-// Weak: both fixture packages link this file into one executable.
-__attribute__((weak)) int fixture_answer(void) {
-    return 42;
-}
diff --git a/scripts/fixtures/build-api/plugin/lib.c.tmpl b/scripts/fixtures/build-api/plugin/lib.c.tmpl
new file mode 100644
index 000000000..1e106862c
--- /dev/null
+++ b/scripts/fixtures/build-api/plugin/lib.c.tmpl
@@ -0,0 +1,5 @@
+// Not weak, and named for the package (`@ID@`): the two fixture packages link into one
+// executable, and each must need its own C source for the link to succeed.
+int @ID@_answer(void) {
+    return 42;
+}
diff --git a/scripts/fixtures/build-api/plugin/lib.zig b/scripts/fixtures/build-api/plugin/lib.zig
deleted file mode 100644
index 0b9956a00..000000000
--- a/scripts/fixtures/build-api/plugin/lib.zig
+++ /dev/null
@@ -1,3 +0,0 @@
-//! The fixture plugin's dependency of its own: Zig declaring a function that `lib.c` defines, so
-//! a lost import or a lost C source fails the plugin's compile or link.
-pub extern fn fixture_answer() c_int;
diff --git a/scripts/fixtures/build-api/plugin/lib.zig.tmpl b/scripts/fixtures/build-api/plugin/lib.zig.tmpl
new file mode 100644
index 000000000..70567a924
--- /dev/null
+++ b/scripts/fixtures/build-api/plugin/lib.zig.tmpl
@@ -0,0 +1,5 @@
+//! The fixture plugin's dependency of its own: Zig declaring the function that `lib.c` defines
+//! under a name of this package alone, so a lost import or a lost C source fails the plugin's
+//! compile or link.
+extern fn @ID@_answer() c_int;
+pub const answer = @ID@_answer;
diff --git a/scripts/fixtures/build-api/plugin/plugin.zig b/scripts/fixtures/build-api/plugin/plugin.zig
index dffb3e589..ffe5af9b0 100644
--- a/scripts/fixtures/build-api/plugin/plugin.zig
+++ b/scripts/fixtures/build-api/plugin/plugin.zig
@@ -40,7 +40,7 @@ const vtable: sdk.Plugin.VTable = .{};
 
 pub fn register(host: *sdk.Host) !void {
     // Calls into the C source of the package's own dependency: it must have reached the link.
-    if (fixture_lib.fixture_answer() != 42) return error.FixtureDependency;
+    if (fixture_lib.answer() != 42) return error.FixtureDependency;
     try writeAndLoadTape(host.allocator);
     try host.registerPlugin(&plugin);
     try host.registerSurface(.{