`linux/runner/` is Flutter's stock GTK host program. On macOS the GTK development headers are absent, so clangd cannot resolve <gtk/gtk.h>, G_DECLARE_FINAL_TYPE never expands, and a six-line main.cc reports seven errors for symbols that macro produces. They are editor diagnostics, not build errors — the file compiles unchanged on Linux, and nothing in the Flutter toolchain reads clangd. Suppressing them beats editing generated code the Linux build needs. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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