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: 
    buildInputs = [
      glib
      gobject-introspection
    ];
  
    checkInputs = [
  
negative.code:   patches = [
      # Add option for changing installation path of installed tests.
      ./0001-meson-add-options-for-tests-installation-dirs.patch
    ];
  
    depsBuildBuild = [
      pkg-config
    ];
  
    nativeBuildInputs = [
  