mcrypt is an encryption program which replaces old unix crypt program. The libmcrypt is the library file of mcrypt. CentOS version 6 repolist does not maintain mcrypt and libmcrypt, if you really must use mcrypt or libmcrypt use the Fedoraproject EPEL repolist: rpm -ivh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-7.noarch.rpm or rpm -ivh http://download.fedoraproject.org/pub/epel/6/i386/repoview/epel-release.html then do yum update You should … Continue reading CentOS 6.2: mcrypt and libmcrypt not found in yum repolist →