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试图安装一个宝石（宝石安装护栏）失败，此错误：命令gem install rails failed with permissions error？
错误：在执行宝石...（GEM :: FilePermissionError）您没有写权限到/ usr/lib中/红宝石/gems/1.8目录。 任何人有想法如何解决这个问题？
我想从unix安装导轨。
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