Install epel
From KlavoWiki
CentOS 7
cd /usr/src rpm -Uvh https://dl.fedoraproject.org/pub/epel/7/x86_64/Packages/e/epel-release-7-11.noarch.rpm
CentOS 6
rpm -Uvh https://dl.fedoraproject.org/pub/epel/6/x86_64/Packages/e/epel-release-6-8.noarch.rpm