centos 5.4下测试通过：
yum install foo
rpm -Uvh http://mirrors.163.com/rpmfusion/free/el/updates/testing/5/x86_64/rpmfusion-free-release-5-0.1.noarch.rpm rpm -Uvh http://mirrors.163.com/rpmfusion/nonfree/el/updates/testing/5/x86_64/rpmfusion-nonfree-release-5-0.1.noarch.rpm
顺便说一句，使用yum install unrar时出错时。需要依赖这个包。