解决 /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwi

cocoapods 在 Mac10.11 遇到如果下问题

/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin15/rbconfig.rb:213: warning: Insecure world writable dir /usr/local/bin in PATH, mode 040777
ERROR: While executing gem ... (Errno::EPERM)
Operation not permitted - /usr/bin/pod

解决：

sudo gem install -n /usr/local/bin cocoapods