anchor.diff:  
   let self = stdenv.mkDerivation rec {
     pname = "mutter";
  -  version = "40.4";
  +  version = "41.0";
   
     outputs = [ "out" "dev" "man" ];
   
     src = fetchurl {
       url = "mirror://gnome/sources/mutter/${lib.versions.major version}/${pname}-${version}.tar.xz";
  -    sha256 = "sha256-pxwVnNKshKZ32l+nrMSUg7Jifa13L4gPiJ645FMKHiM=";
  +    sha256 = "sha256-+oChp0QETYjr/Wd/8DID1ncF7SzWJOoGy7i1iUjN+J4=";
     };
   
     patches = [
  
positive.code:     mesa # needed for gbm
      meson
      ninja
      pkg-config
      python3
      wrapGAppsHook
  
negative.code: , zenity
  , libcanberra
  , ninja
  , xvfb-run
  , xkeyboard_config
  , libxkbfile
  , libXdamage
  