anchor.diff:  
     postPatch = ''
       patchShebangs tests/gen-installed-test.py
  -  '' + lib.optionalString (stdenv.buildPlatform == stdenv.hostPlatform) ''
       PATH=${python3.withPackages (pp: [ pp.pygobject3 pp.tappy ])}/bin:$PATH patchShebangs tests/introspection.py
     '';
   
  
positive.code: , nix-update-script
  , pkg-config
  , meson
  , ninja
  , python3
  , mutest
  
negative.code:     gobject-introspection
      python3
      makeWrapper
    ] ++ lib.optionals (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) [
      mesonEmulatorHook
    ];
  
    buildInputs = [
  