title: Error installing gem capybara-webkit
body: <p>I am new to ruby, but while trying to install capybara to run test on my system I get the following error. Im running OSX</p>
  
  <pre><code>my_app$ gem install capybara-webkit
  Building native extensions.  This could take a while...
  ERROR:  Error installing capybara-webkit:
  ERROR: Failed to build gem native extension.
  
  /Users/joe/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
  
  Gem files will remain installed in /Users/joe/.rvm/gems/ruby-1.9.2-p290/gems/capybara-webkit-0.7.2 for inspection.
  Results logged to /Users/joe/.rvm/gems/ruby-1.9.2-p290/gems/capybara-webkit-0.7.2/./gem_make.out
  </code></pre>
  
  <p>here are results from gem_make.out</p>
  
  <pre><code>/Users/joe/.rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb
  </code></pre>