title: Linking with a debug/release lib with qmake/Qt Creator
body: <p>I am using Qt Creator and have a Qt GUI project that depends on a C++ static library project.  I want to link the release version of the GUI app with the release build of the .lib and the debug release of the GUI app with the debug .lib.  I have found out how to add additional libraries to the project by including a line like the following in my .pro file:</p>
  
  <p><code>LIBS += -L./libfolder -lmylib.lib</code></p>
  
  <p>But I cannot see how I can use a different <code>-L</code> command for release and debug builds.</p>
  
  <p>Is there support in qmake to do this?</p>