我正在尝试在 CentOS 5.4（最终版）上安装 qemu：
yum install qemu
结果是：
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirror.steadfast.net
* base: mirrors.cat.pdx.edu
* extras: mirror.rocketinternet.net
* updates: mirror.rocketinternet.net
Excluding Packages from CentOS-5 - Base
Finished
Excluding Packages from CentOS-5 - Updates
Finished
Setting up Install Process
No package qemu available.
Nothing to do
有人能帮帮我吗？我应该添加哪个存储库？