title: Interrupting a long MacPorts installation
body: <p>I'm currently installing <a href="http://www.macports.org/ports.php?by=library&amp;substr=qt4-mac" rel="nofollow">qt4-mac</a> and it's taking forever to build. I've searched around and I've discovered that it's going to take anywhere from 2-5 hours to install.</p>
  
  <p>Is there a way to interrupt this installation process and if so do I need to do some clean-up afterwards?</p>