title: Rspec errors in Rails app using Nitrous.io - 'cannot open shared object file'
body: <p>When I run <code>bundle exec rspec spec/</code> I get the following messages in the console:    </p>
  
  <pre><code>Could not open library 'libgtkmm-2.4': libgtkmm-2.4: cannot open shared object file: No such file or directory.                                                                       
  Could not open library 'libgtkmm-2.4.so': libgtkmm-2.4.so: cannot open shared object file:     No such file or directory.                                                                 
  Could not open library 'libgtkmm-2.4.so.1': libgtkmm-2.4.so.1: cannot open shared object file: No such file or directory.                                                             
  Could not open library 'libgtkmm-3.0': libgtkmm-3.0: cannot open shared object file: No such file or directory.                                                                       
  Could not open library 'libgtkmm-3.0.so': libgtkmm-3.0.so: cannot open shared object file: No such file or directory.                                                                 
  Could not open library 'libgtkmm-3.0.so.1': libgtkmm-3.0.so.1: cannot open shared object file: No such file or directory
  </code></pre>
  
  <p>But, all of the tests pass and my app works just fine. Can anyone fill me in on what may have happened? Should I just scrap this box and clone my repo into a fresh one? I'm using Ruby 2.0.0p247 and Rails 4.0.2 in a Nitrous.io box. Thanks.</p>