title: How to run c/c++ app in QT Creator on Ubuntu
body: <p>I have Ubuntu 13.04 on my PC and QT Creator </p>
  
  <p>When I try to run c/c++ simple application I says that:</p>
  
  <p>"QT Creator needs a compiler set up to build. Configure compiler in the kit options"</p>
  
  <p>Then I go to the Tools->Options->Build&amp;Run->Kits
  and I see that in Auto-detected there is "Desktop Qt 5.2.1 GCC 32bit (default)"
  but before it there is a ! and it says that "Error:no compiler set in kit"</p>
  
  <p>I really can't get it. THere are a lot of tutorials, but nothig said about such a situation.</p>
  
  <p>Thank you in advance!</p>