anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "gtk4";
  -  version = "4.6.3";
  +  version = "4.6.4";
   
     outputs = [ "out" "dev" ] ++ lib.optionals x11Support [ "devdoc" ];
     outputBin = "dev";
  
positive.code: 
    src = fetchurl {
      url = "mirror://gnome/sources/gtk/${lib.versions.majorMinor version}/gtk-${version}.tar.xz";
      sha256 = "pXrNDkSCmBcA/fhllsdBPLYe9H915HR/2oCegjG42Ww=";
    };
  
    patches = [
      # Fix GNOME Control Center crash.
      # https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/4670
      (fetchpatch {
        url = "https://gitlab.gnome.org/GNOME/gtk/-/commit/ae0166973795e750f08b89f9f0ef974d7ac48bc7.patch";
        sha256 = "qPOplocE+RcTFIEveJe8YLKiUpe7o6CiA834rZpS0Fs=";
      })
    ];
  
    nativeBuildInputs = [
      gettext
  
negative.code: , stdenv
  , substituteAll
  , fetchurl
  , pkg-config
  , gettext
  , graphene
  