最近调研百度efe 的saber框架，需要安装php-cgi依赖，
Ubuntu下安装的方法非常简单，
sudo apt-get install php5-cgi
如果是mac的话，参见 http://stackoverflow.com/questions/27232483/how-to-install-php-cgi-as-a-plugin-in-mac-os-os-x-10-10
这篇文章，brew install php54(并将php-cgi可执行程序添加到环境变量中)
![sudo apt-get update 出错 Updating from such a repository can‘t be done securely, and is therefore[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)