For use this repo create file centos.alt.ru.repo in /etc/yum.repo.d

for CentOS/RHEL 5

[CentALT]
name=CentALT Packages for Enterprise Linux 5 - $basearch
baseurl=http://centos.alt.ru/repository/centos/5/$basearch/
enabled=1
gpgcheck=0


and enable EPEL repository

for i386 
rpm -ihv http://download.fedora.redhat.com/pub/epel/5/i386/epel-release-5-3.noarch.rpm

for x86_64
rpm -ihv http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-3.noarch.rpm


for CentOS/RHEL 6

[CentALT]
name=CentALT Packages for Enterprise Linux 6 - $basearch
baseurl=http://centos.alt.ru/repository/centos/6/$basearch/
enabled=1
gpgcheck=0


and enable EPEL repository

for i386 
rpm -ihv http://download.fedora.redhat.com/pub/epel/6/i386/epel-release-6-5.noarch.rpm

for x86_64
rpm -ihv http://download.fedora.redhat.com/pub/epel/6/x86_64/epel-release-6-5.noarch.rpm