# yum -y install yum-plugin-priorities
# vi /etc/yum.repos.d/CentOS-Base.repo
[base]
[updates]
[extras]
に
priority=1
追加
# wget https://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-2.el6.rf.i686.rpm
# rpm -ivh rpmforge-release-0.5.2-2.el6.rf.i686.rpm
# rm -f rpmforge-release-*
# yum -y update rpmforge-release