title: Qt creator: qmake is not recognized
body: <p>I am trying to understand 'qmake' by following <a href="http://qt-project.org/doc/qt-5.0/qtdoc/qmake-tutorial.html" rel="nofollow">this tutorial</a> . but when I come the the following command:</p>
  
  <pre><code>qmake -o Makefile hello.pro
  </code></pre>
  
  <p>my command line console shows me this message:</p>
  
  <pre><code>'qmake' is not recognized as an internal or external command, operable program or batch file
  </code></pre>
  
  <p>I understood that qmake is part of Qt creator and thus it should be executed whenever I run it within my project's folder. so, why it is not recognized ?</p>