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PyGObject >= 3.52 dropped the standalone gobject-introspection girepository-1.0 dependency and now builds against girepository-2.0, which was merged into GLib 2.80. The linux extra pins PyGObject>=3.46 with no upper bound, so pip resolves the newest release (3.56.3) and meson aborts metadata generation with: Dependency 'girepository-2.0' is required but not found. because CI only installed the old libgirepository1.0-dev. Swap libgirepository1.0-dev -> libgirepository-2.0-dev (shipped by GLib 2.80 on the ubuntu-latest / 24.04 runner) across all three Linux pip-install paths so they stay in sync: - test.yml: the failing linux-smoke job. - release.yml: build-linux, which would otherwise ship a broken Linux tarball on the next tag. - build.yml: build-linux had no system-deps step at all; added the matching apt install so the manual artifact build works too. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>