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

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

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

解决如下:

更新ruby;

$:brew install rbenv ruby-build

$:rbenv global 2.1.2

$:gem update --system,重新打开shell,执行命令

然后:sudo 执行命令

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