title: make arguments with qt creator
body: <p>I have imported an existing Makefile-based project into Qt. So no qmake, no CMake, no nothing, just one <code>makefile</code>. All is well, but the project is very large and I want to build it in parallel (<code>make -j40</code> or whatever). How do I set up <code>make</code> arguments in Qt Creator?</p>
  
  <p>Of course I can always run <code>make</code> from the shell but hey I want pretty buttons and stuff!</p>