title: no such file to load -- readline
body: <p>I am getting the following error:</p>
  
  <pre><code>$script/console
  Loading development environment (Rails 2.2.2)
  /opt/ruby-enterprise-1.8.6-20080709/lib/ruby/1.8/irb/completion.rb:10:in `require': no such file to load -- readline (LoadError)
  </code></pre>
  
  <p>Where can i get the file and what directory should it go in?</p>
  
  <p>Thanks!</p>