anchor.diff:  { stdenv
   , fetchurl
   , gettext
  +, makeWrapper
   , perl
   
   , at-spi2-atk
  
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: 
    postInstall = "rm -rvf $out/share/gtk-doc";
  
    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
  