PHP problems - Fedora 13 perfect server setup

[K_meleonu]

Hello to all,
I have installed yesterday a server with Fedora 13 as operating server and ISPConfig 2.
The problem is that i cannot use any PHP operating CMS.
It gives me a lot of errors.
If i use php fusion CMS i get errors and it dowsn't read the php code as it should (example - cnplesoianu.ro ).
If i try to install joomls it gives me errors (wich i see in the error log) and shows a blank page.
PHP Fatal error: Class 'JVersion' not found in /home/www/web1/web/libraries/cms.php on line 29
In cms.php i have
// Define the Joomla version if not already defined.
if (!defined('JVERSION')) {
$jversion = new JVersion;
define('JVERSION', $jversion->getShortVersion());
}

Triyed with diferent versions of joomla, even with a back-up of an old site and same problem.

I think it is a PHP problem but i cannot find it.

Can anyone give some indications of how to resolve this problem?