generic: {
  v42 = generic {
    version = "4.2.6";
    sha256 = "0r08v9ka0v8d7w133yr09vaxzl5lhbrsvbx900x15qv8lwliysv4";
  };

  v40 = generic {
    version = "4.0.12";
    sha256 = "1jlbzlz0rzcjixicdcd7xcjhfqwr82hngpazx85f40r9dy574pjw";
  };

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