anchor.diff:      gsettings-desktop-schemas
       gnome-keyring
       glib
  -    gcr
  +    gcr_4
       accountsservice
       libsecret
       polkit
  
positive.code: , gobject-introspection
  , wrapGAppsHook
  , libxslt
  , gcr
  , accountsservice
  , gdk-pixbuf
  , gdm
  
negative.code: in
  stdenv.mkDerivation rec {
    pname = "gnome-shell";
    version = "43.beta";
  
    outputs = [ "out" "devdoc" ];
  
    src = fetchurl {
      url = "mirror://gnome/sources/gnome-shell/${lib.versions.major version}/${pname}-${version}.tar.xz";
      sha256 = "4Ri5bdn1sL0UVOSneXgPPVfONUD6vqmhaBonrpzelME=";
    };
  
    patches = [
  