mac虽然装好Ruby，但是我执行：
gem install sass
居然报：
You don't have write permissions into the /Library/Ruby/Gems/1.8 directory
我这种小白只能：
sudo gem install sass
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mac下安装sass
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mac虽然装好Ruby，但是我执行：
gem install sass
居然报：
You don't have write permissions into the /Library/Ruby/Gems/1.8 directory
我这种小白只能：
sudo gem install sass
