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

  v40 = generic {
    version = "4.0.19";
    sha256 = "0csiva0iddzdf18lii7vwlvp91kh3vfl8r90jpcsnsivaqwfnkbr";
  };

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