anchor.diff:      pango
       systemd_lib
       wayland
  +  ] ++ optionals (xorg != null) [
       xorg.inputproto
       xorg.libX11
       xorg.libXcomposite
  
positive.code: 
  with {
    inherit (stdenv.lib)
      enFlag;
  };
  
  stdenv.mkDerivation rec {
    name = "clutter-${version}";
    versionMajor = "1.24";
    versionMinor = "2";
    version = "${versionMajor}.${versionMinor}";
  
    src = fetchurl {
      url = "mirror://gnome/sources/clutter/${versionMajor}/${name}.tar.xz";
      sha256 = "0qyd0cw17wi8gl6y9z2j2lh2gwghxskfmsdvw4ayrgxwnj6cjccn";
    };
  
    nativeBuildInputs = [
  
negative.code:     "--disable-installed-tests"
      "--disable-always-build-tests"
      "--disable-examples"
      (wtFlag "x" (xorg != null) null)
    ];
  
    meta = with stdenv.lib; {
  