centos6 install mcrypt

1. Download the latest epel-release rpm from

   http://dl.fedoraproject.org/pub/epel/6/x86_64/

2. Install epel-release rpm:

   # rpm -Uvh epel-release*rpm

3. Install libmcrypt-devel rpm package:

   # yum install libmcrypt-devel

4. http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

https://pkgs.org/centos-6/epel-x86_64/libmcrypt-devel-2.5.8-9.el6.x86_64.rpm.html

rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-6