How to install php-mcrypt for php-5.4 on CentOs 6.x SCL wget http://rpms.southbridge.ru/rhel6/php-5.4/x86_64/php-mcrypt-5.4.16-1.el6.x86_64.rpm By EPEL: yum inatall libmcrypt yum install php-common rpm2cpio php-mcrypt-5.4.16-1.el6.x86_64.rpm | cpio -idmv