title: Adding Qt to existing GNU C++ program
body: <p>I have a current C++ program built using GNU make. It is reasonably large - about a dozen .cpp files and a similar number of headers.</p>
  
  <p>It all runs off the command line and currently just outputs to cout and cerr.</p>
  
  <p>I want to add Qt interface elements to it - what is the best way to do this? </p>
  
  <p>(I have built some Qt stuff in the past (not for a few years) though I am rusty - the C++ code I have now works and I don't want to change that, just fix the way it outputs information to the end user.)</p>