generic: {
  v44 = generic {
    version = "4.4.8";
    sha256 = "0l9n4l5179lf90krv1kb0lraipj7q4hyba6r48n6rj2zqx2j4mn0";
  };

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

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