PHP 5 what?
MySQL client version: 4.1.15
PHP version 5
No, despite being able to take advantage of PDO in PHP 5.1.x environments, xPDO and MODx 0.9.7 should work back to PHP 4.3.3+ (though I would recommend at least PHP 4.4.+ for many reasons). If it’s not working because of the PHP version, then it is a bug. This is possible, as I am not able to keep up with PHP 4 testing on all commits, but in general, it is designed to work in PHP 4 as well.
My bad, After looking into this a bit more the server is using php 4.4.4. Is 5x required for this version.