title: Qt Creator: Could not start process ""
body: <p>faced with an issue during qt creator using (re-build action):</p>
  
  <blockquote>
    <p>Running steps for project algolist...  Could not start process "" clean
    Error while building/deploying project algolist (kit: MSVC2015)</p>
  </blockquote>
  
  <p>Environment settings:</p>
  
  <ol>
  <li>QtCreator 3.5.1</li>
  <li>Windows 10 (and SDK forWin10)</li>
  <li>visual c++ compiler with libraries version 19 </li>
  <li>I do not use any qt libraries in a project, and havew an installed qt kit just for qmake support (qmake is a build tool for my project)</li>
  <li>all compiler's settings are manual via INCLUDE/LIB/PATH. and this configuration works on my other machine, can't find a differences and the message above doesn't look informative, could you someone explain me please what this mean ? 
  thanks</li>
  </ol>