anchor.diff:  , stdenv
   , substituteAll
   , fetchurl
  -, fetchpatch
   , pkg-config
   , gettext
   , graphene
  
positive.code: 
  stdenv.mkDerivation rec {
    pname = "gtk4";
    version = "4.6.3";
  
    outputs = [ "out" "dev" ] ++ lib.optionals x11Support [ "devdoc" ];
    outputBin = "dev";
  
negative.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/gtk/${lib.versions.majorMinor version}/gtk-${version}.tar.xz";
      sha256 = "p5orvMeTG3A/xPofy+G5BuIpoVIthU1SKAF2anm8rJ8=";
    };
  
    nativeBuildInputs = [
      gettext
  