title: qmake issue while installing capybara-webkit gem?
body: <p>I'm trying to install <strong>capybara-webkit</strong> gem and it's throwing the following error. </p>
  
  <p><code>qmake: could not exec '/usr/lib/x86_64-linux-gnu/qt4/bin/qmake': No such file or directory</code></p>
  
  <p>What is the solution to solve this error?</p>