i start installing phalcon on my cent os vps form this website : https://tecadmin.net/install-phalcon-php-framework-on-centos-redhat/
php version is : 5.1.6
and when i try to build it , i see more of more errors like that : 1 : /cphalcon/build/32bits/phalcon.zep.c:4528: error: expected '=', 2 : cphalcon/build/32bits/phalcon.zep.c:6913: error: 'ZEND_FETCH_CLASS_MASK' undeclared (first use in this function) and ......