ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
系权限问题，命令行输入：
sudo gem install cocoapods，即可安装
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ERROR: While executing gem ... (Gem::FilePermissionError)
You don't have write permissions for the /Library/Ruby/Gems/2.0.0 directory.
系权限问题，命令行输入：
sudo gem install cocoapods，即可安装
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