anchor.diff:  
     src = fetchurl {
       url = "mirror://gnome/sources/gtk/${lib.versions.majorMinor version}/gtk-${version}.tar.xz";
  -    sha256 = "D6ramD3GsLxAnLNMFxPB8yZ+Z8CT+GseOxfbYQCj3fQ=";
  +    sha256 = "eC1ZUfv9WF/J7HbAnQfijmAUxy2wAftWf/8hf7luTYw=";
     };
   
     nativeBuildInputs = [
       gettext
       gobject-introspection
       makeWrapper
  -    meson
  +    meson_0_60
       ninja
       pkg-config
       python3
  
positive.code: , xorg
  , libepoxy
  , libxkbcommon
  , libxml2
  , gnome
  , gsettings-desktop-schemas
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gtk4";
    version = "4.6.0";
  
    outputs = [ "out" "dev" ] ++ lib.optionals x11Support [ "devdoc" ];
    outputBin = "dev";
  