Thinking more...

先確定有EPEL，然後:
$sudo yum install python26
再裝 python26-virtualenv python-pip:
$yum install python26-virtualenv python-pip

製作環境：
$mkdir -p python-envs
$cd python-envs
$virtualenv-2.6 --no-site-packages --distribute myenv
$pip-python install -E myenv yolk

啟用:
$source myenv/bin/activate
$yolk -l