mac 下装cocoapods时遇到的问题：please install libyaml and reinstall your ruby

安装cocoapods时遇到的问题：

please install libyaml and reinstall your ruby.

明明安装了libyaml，还一直提示没有安装

"It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby."

/home/ec2-user/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/yaml.rb:56:in `<top  (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.

解决方法：

如果使用homebrew，一个简单的方法是

If using homebrew, a temporary fix that worked for me was to run:

brew unlink libyaml && brew link libyaml

其他解决方法参考http://stackoverflow.com/questions/15738883/please-install-libyaml-and-reinstall-your-ruby

祝你好运