升级了 OS X 10.11 ,cocoapods失效
sudo nvram boot-args="rootless=0"; sudo reboot
sudo gem install cocoapods -V
sudo gem install -n /usr/local/bin cocoapods pod install
一下后，提示错误的话，试试下面的命令
sudo xcode-select --switch /Applications/Xcode.app 原文：http://my.oschina.net/u/555006/blog/510295