Actually php55u works fine, but since WHMCS doesn't support it, i'd need to use PHP 5.4. PHP 5.3 is outdated

Now i get:
Stopping php54m-fpm: [ OK ]
Starting php54m-fpm: Zend OPcache requires Zend Engine API version 220090626.
The Zend Engine API version 220100525 which is installed, is newer.
Contact Zend Technologies at
http://www.zend.com/ for a later version of Zend OPcache.
My research shows . 220090626 is the Zend API version for PHP 5.3. Could PHP 5.4.27 in Kloxo-MR have been compiled with wrong Zend API?