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: 
    buildInputs = [
      libxkbcommon
      libepoxy
      isocodes
    ] ++ lib.optionals vulkanSupport [
  
negative.code:     glib
      graphene
      pango
    ] ++ lib.optionals waylandSupport [
      wayland
    ] ++ lib.optionals vulkanSupport [
      vulkan-loader
    ] ++ [
  