title: Cannot find -lQt5Guid and -lQt5Cored
body: <p>I am currently trying to compile a Qt application that I <a href="https://github.com/bjorn/tiled" rel="nofollow">downloaded from github</a> on my windows machine. I did not have any trouble compiling this on Ubuntu so I was hoping someone could help shed some light on my problem.</p>
  
  <p>I am using Qt-Creator to compile the program.</p>
  
  <p>The exact error messages are:</p>
  
  <pre><code>:-1: error: cannot find -lQt5Guid
  :-1: error: cannot find -lQt5Cored
  collect2.exe:-1: error: error: ld returned 1 exit status
  </code></pre>
  
  <p>My first idea when reading those messages was that the windows PATH variable does not include the locations of the libraries. But when I checked, my PATH contained the following:</p>
  
  <pre><code>C:\Qt\Qt5.1.0\5.1.0\mingw48_32\bin;C:\Qt\Qt5.1.0\Tools\mingw48_32\bin;...
  </code></pre>
  
  <p>Which exists and contains what looks like the correct Dlls.</p>
  
  <p>I am using MingGW rather than the visual studio compiler (although i have it available if needs be).</p>
  
  <p>How can I fix this error and what could be causing it?</p>
  
  <p><strong>EDIT</strong>: When I run qmake there does not seem to be any problem. The errors come up when I try to build the project.</p>