1. Install epel and remi repositories:
# wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
# sudo rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
2. Enable remi repository:
# sudo vi /etc/yum.repos.d/remi.repo
In the [remi] section of the file, set the "enabled" option to 1.
