title: Please install libyaml and reinstall your ruby
body: <p>libyaml warning doesn't go away, even if you install libyaml</p>
  
  <pre><code>gem install bundler
  /home/ec2-user/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/yaml.rb:56:in `&lt;top  (required)&gt;':
  It seems your ruby installation is missing psych (for YAML output).
  To eliminate this warning, please install libyaml and reinstall your ruby.
  Fetching: bundler-1.3.4.gem (100%)
  Successfully installed bundler-1.3.4
  </code></pre>