title: Qt Cannot open include file: 'QPrinter'
body: <p>I am new to Qt. Downloaded source code for a Qt application of SourceForge, and tried to build and run it. After working through a few similar problems by adding <code>QT +=</code> statements to .pro files, I am stuck on this one:</p>
  
  <p>On attempting to build in Qt Creator, I get errors saying  </p>
  
  <blockquote>
    <p>error: C1083: Cannot open include file: 'QPrinter': No such file or directory </p>
  </blockquote>
  
  <p>I tried adding <code>QT += printsupport</code> to the .pro file, cleaning, and rebuilding, but that gives this error</p>
  
  <blockquote>
    <p>Error: dependent '..\..\..\..\..\..\..\..\..\..\..\Qt\Qt5.1.1\5.1.1\msvc2012_64\include\QtPrintSupport\qtprintsupportglobal.h' does not exist."</p>
  </blockquote>
  
  <p>When I go to <code>C:\Qt\Qt5.1.1\5.1.1\msvc2012_64\include\QtPrintSupport</code>, qtprintsupportglobal.h IS THERE!</p>