<http://schema.org/url>
<http://blog.jeffdouglas.com/2011/08/01/ruby-1-9-2-install-errors-with-mac-os-x-lion-and-rvm/>
<http://blog.jeffdouglas.com/2011/08/01/ruby-1-9-2-install-errors-with-mac-os-x-lion-and-rvm/>