os 10.11 版本安裝失敗

1  gem install cocoapods

ERROR:  While executing gem ... (Gem::FilePermissionError)

    You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.

2.sudo gem install cocoapods

ERROR:  While executing gem ... (Errno::EPERM)

    Operation not permitted - /usr/bin/xcodeproj

mac os10.11 - usr/bin 是readonly ,更換安裝位置

3.sudo gem install cocoapods -n/usr/local/bin

安裝成功