anchor.diff:  , gtk3
   , libcanberra-gtk3
   , pam
  +, libgudev
   , libselinux
   , keyutils
   , audit
  
positive.code:     keyutils
      libX11
      libcanberra-gtk3
      libselinux
      pam
      plymouth
  
negative.code: 
  stdenv.mkDerivation rec {
    pname = "gdm";
    version = "42.0";
  
    outputs = [ "out" "dev" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/gdm/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "oyisl2k3vsF5lx/weCmhJGuYznJBgcEorjKguketOFU=";
    };
  
    mesonFlags = [
  