title: Adding module to existing Qt5 installation from source
body: <p>I have an existing Qt5.3.2 installation from tar.gz source files.</p>
  
  <p>When attempting to compile VTK, which has optional Qt{4,5} interface, I was informed I don't have QtWebKitWidgets by ccmake.</p>
  
  <p>I don't particularly want to reinstall Qt5 on top of the existing installation, for fear of breaking other things built against it.</p>
  
  <p>Can I add to my current Qt5?</p>
  
  <p>Would variants on</p>
  
  <pre><code>/path/to/configure -release -prefix $existingPrefix
  make -module-qtwebkit
  make install
  </code></pre>
  
  <p>or </p>
  
  <pre><code>/path/to/configure -release -prefix $newPrefix
  make -module-qtwebkit
  make install
  cp -rf $newPrefix/CMake/QtWebKit (or similar path) $existingPrefix/CMake/
  </code></pre>
  
  <p>or as above, but with symlink, work?</p>