self: super: {
  gnome = super.gnome.overrideScope (gnomeFinal: gnomePrev: {
      mutter = gnomePrev.mutter.overrideAttrs ( old: {
        src = super.fetchgit {
          url = "https://gitlab.gnome.org/vanvugt/mutter.git";
          # GNOME 45: triple-buffering-v4-45
          rev = "0b896518b2028d9c4d6ea44806d093fd33793689";
          sha256 = "sha256-mzNy5GPlB2qkI2KEAErJQzO//uo8yO0kPQUwvGDwR4w=";
        };
      });
  });
}