generic: {
  v42 = generic {
    version = "4.2.7";
    sha256 = "09znh8x1sass5mw6wjrfmizjbfls8ad2c16y24ldfj40hlfxz6wx";
  };

  v40 = generic {
    version = "4.0.13";
    sha256 = "1hz4sdj4nw8fh124dqd41ag2wv4rcp4snpxgk80nx76rssw6c9ny";
  };

  v30 = generic {
    version = "3.0.28";
    sha256 = "16966danf5ww4lhjg5gx5bnpid8abxh2ymdg6k5mymrman5bcdjj";
  };
}