title: QtCreator - no rule to make target when building windeployqt
body: <p>I have installed <code>C:\Qt\5.6\</code> on Windows 10. I have started QtCreator from there, and opened <code>C:\Qt\5.6\Src\qttools\qttools.pro</code> in it. I expanded the node, and right-clicked on <code>designer</code> and did <code>Build "designer"</code>, it built fine (using mingw)</p>
  
  <p>Now, I try to do the same for <code>windeployqt</code>, but it fails with: </p>
  
  <pre><code>:-1: error: No rule to make target 'C:/Qt/5.6/mingw49_32/lib/libQt5Bootstrapd.a', needed by '..\..\bin\windeployqt.exe'.  Stop.
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ravIW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ravIW.png" alt="qttools"></a></p>
  
  <p>What am I missing, and how can I get <code>windeployqt</code> to compile?</p>