title: CMake cannot resolve runtime directory path
body: <p>After running cmake CMakeLists.txt</p>
  
  <p>I get the following warning</p>
  
  <pre><code>CMake Warning at src/CMakeLists.txt:32 (add_executable):
    Cannot generate a safe runtime search path for target MMPEditor because
    files in some directories may conflict with libraries in implicit
    directories:
  
  runtime library [libQt5Widgets.so.5] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
    /home/ch/Qt/5.2.1/gcc_64/lib
  runtime library [libQt5Core.so.5] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
    /home/ch/Qt/5.2.1/gcc_64/lib
  runtime library [libQt5Gui.so.5] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
    /home/ch/Qt/5.2.1/gcc_64/lib
  runtime library [libQt5OpenGL.so.5] in /usr/lib/x86_64-linux-gnu may be hidden by files in:
    /home/ch/Qt/5.2.1/gcc_64/lib
  </code></pre>
  
  <p>Some of these libraries may not be found correctly.</p>
  
  <p>What does it mean for one file to be hidden by another and how can I allow CMake to determine which is the right folder to link to?</p>