final: prev: {
  # roms

  pokegb = prev.recurseIntoAttrs {
    # official (chronological order)

    red = prev.callPackage ./pokered { };

    yellow = prev.callPackage ./pokeyellow { };

    gold = prev.callPackage ./pokegold { };

    crystal = prev.callPackage ./pokecrystal { };

    all = prev.callPackage ./pokeall { };
  };
}