title: Qt 5.7 with MinGW: qmake.exe missing
body: <p>I tried to install Qt 5.7 with MinGW on Windows 10 (32bit). In tools -> options -> build&amp;run I see that the programm has found the MinGW debuggers (gdb.exe) and the MinGW Compilers automatically, but there is no MinGW-Qt-Version and no MinGW Kit. As I understand, one can add them, but for the Qt-Version one needs qmake.exe (MinGW -> bin...). That doesn't exist.
  I also tried to install MinGW seperately, but there the qmake.exe didn't come up as well.
  Copying the qmake.exe from another computer didn't help. If I use the copied version for "creating" a MinGW-Qt-Version, it says something like: "The Qt-Version isn't installed properly, please execute make install".</p>
  
  <p>I've read <a href="https://stackoverflow.com/questions/22604126/qt-5-2-has-no-kit-or-qmake-with-mingw-after-installation">QT 5.2 has no kit or qmake with MingW after installation</a> and some other questions, but couldn't find a helpful answer.</p>
  
  <p><a href="https://wiki.qt.io/Building_Qt_Desktop_for_Windows_with_MinGW" rel="nofollow noreferrer">https://wiki.qt.io/Building_Qt_Desktop_for_Windows_with_MinGW</a> says:
  "Do I have to build Qt? Perhaps not. The official Qt SDK installer will work just fine. Follow these steps only if you want to learn how to make a cutom build or if you aim a x64 target. "
  So it should be possible to run Qt without building, shouldn't it?</p>
  
  <p>So what can I do to get qmake.exe? </p>