anchor.diff:      pkg-config
       rustc
       cargo
  -    python3.pkgs.docutils
  +    python3Packages.docutils
       vala
       rustPlatform.cargoSetupHook
     ] ++ lib.optionals withIntrospection [
  
positive.code: , rust
  , cargo
  , gi-docgen
  , python3
  , gnome
  , vala
  , withIntrospection ? stdenv.hostPlatform == stdenv.buildPlatform
  
negative.code:     mv $GDK_PIXBUF/loaders.cache.tmp $GDK_PIXBUF/loaders.cache
    '';
  
    postFixup = lib.optionalString withIntrospection ''
      # Cannot be in postInstall, otherwise _multioutDocs hook in preFixup will move right back.
      moveToOutput "share/doc" "$devdoc"
    '';
  