Your server meets all of XenForo's PHP requirements.
XenForo also requires MySQL 5.0 or newer. Please manually check that you meet this requirement."
How about to add 3 fields - DB, user, psw to check MySQL compatibility in few click ?
I know.... phpinfo, phpmyAmin, cPanel etc... I'll be able to extract such info.
It will be good to combine all together in one testing script.
This is just suggestion.