generic: {
  v44 = generic {
    version = "4.4.7";
    sha256 = "13gckz5ysmqr257mcmbbbf8l43f1jdk4iyn6a3ad8xjmj3kqyys9";
  };

  v40 = generic {
    version = "4.0.20";
    sha256 = "0h6qx4imrf5inmmczxir81a9xhra8a1dxxv538mqhxhbpqn1yh3w";
  };

  v30 = generic {
    version = "3.0.31";
    sha256 = "0a2jznpmg24lqdqbc9p8i2q6jkz0hx53hh6q12xsvvmq48vi3snm";
  };
}