Add sourceforge as repository on Cent os

Open up ssh client and connect to the server as root user

for 32bit:
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.1-1.el5.rf.i386.rpm
For 64 bit
http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.1-1.el5.rf.x86_64.rpm
Install DAG’s GPG key
rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

Or/and download the rpm and install it manually:

For Centos 64:

wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm

rpm -i rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm

then yum update.