I found the solution:
Plesk 8.3/PHP5.2.6
You must include this extension in your PHP build:
--with-apxs2=/usr/sbin/apxs
This will create a file called libphp5.so to this directory:
/usr/lib/httpd/modules/
From there restart apache:
apachectl restart
There u have it๐ It's 3am here, I'm hitting the sack...