何も考えずに
sudo yum -y install adobe-release yum-conf-adobe elrepo-release yum-conf-elrepo
sudo yum -y install epel-release yum-conf-epel rpmforge-release yum-conf-rpmforge
sudo yum -y install rpmfusion-free-release yum-conf-rpmfusion
入れて、個人的には問題もなく使っているけど、