anchor.diff:  , xorgserver
   , python3
   , wrapGAppsHook
  +, gi-docgen
   , sysprof
   , libsysprof-capture
   , desktop-file-utils
  
positive.code:   pname = "mutter";
    version = "43.beta";
  
    outputs = [ "out" "dev" "man" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/mutter/${lib.versions.major version}/${pname}-${version}.tar.xz";
  
negative.code:     pkg-config
      python3
      wrapGAppsHook
      gi-docgen
      xorgserver # for cvt command
    ];
  
  