/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin14/rbconfig.rb:213: warning: Insecure world writable dir /usr/local in PATH, mode 040777

这个提示是说，给/usr/local 这个文件777的权限太大，不安全。 改为775，就没有这个提示了。

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