title: Win 10 - Error: Use the --qmake argument to explicitly specify a working Qt qmake
body: <p>i'm trying to install PyQt5 (5.8.1) on Windows 10. The file was downloaded from RiverBank PyQt5 Download Windows source. When i run configure.py from Python 3.6 idle i got this Error:<br/>
  Use the --qmake argument to explicitly specify a working Qt qmake.<br/>
  <br/>
  Can someone help me?<br/>
  Thanks </p>