anchor.diff:  
     postInstall = "rm -rvf $out/share/gtk-doc";
   
  -  # TODO: disable unnecessary tests
  -  doCheck = false;
  +  preFixup = ''
  +    wrapProgram $out/bin/gtk3-demo-application \
  +      --prefix 'XDG_DATA_DIRS' : "$GSETTINGS_SCHEMAS_PATH"
  +
  +    wrapProgram $out/bin/gtk3-widget-factory \
  +      --prefix 'XDG_DATA_DIRS' : "$GSETTINGS_SCHEMAS_PATH"
  +  '';
   
     passthru = {
       inherit
  
positive.code: stdenv.mkDerivation rec {
    name = "gtk+-${version}";
    versionMajor = "3.20";
    versionMinor = "5";
    version = "${versionMajor}.${versionMinor}";
  
    src = fetchurl {
      url = "mirror://gnome/sources/gtk+/${versionMajor}/${name}.tar.xz";
      sha256Url = "mirror://gnome/sources/gtk+/${versionMajor}/${name}.sha256sum";
      sha256 = "9790b0267384904ad8a08e7f16e5f9ff1c4037de57788d48d1eaf528355b1564";
    };
  
    nativeBuildInputs = [
      gettext
      perl
    ];
  
  
negative.code: { stdenv
  , fetchurl
  , gettext
  , makeWrapper
  , perl
  
  , at-spi2-atk
  