title: Qt Creator build project - No such file or directory
body: <p><br>
  Sorry to being a noob, but I just moved from Window, Eclipse and Java to OpenSUSE, C++ and Qt Creator, and I met a problem. I am working to create a QGIS application, I have the *.h files in /usr/include/gqis, and *.so files in /usr/lib. I added this line</p>
  
  <pre><code>INCLUDEPATH += /usr/local/include/qgis
  </code></pre>
  
  <p>at the end of .pro file of project so I can include QGIS library. So far as I coded, everything went smoothly, but when I built the project, Qt Creator threw an error:<br></p>
  
  <pre><code>qgis.h: No such file or directory
  /usr/include/qgis/qgsapplication.h
  </code></pre>
  
  <p>and it mapped to line 4:</p>
  
  <pre><code>#include &lt;QtGui/QApplication&gt;
  #include "mainwindow.h"
  #include &lt;qgis/qgsvectorlayer.h&gt;
  #include &lt;qgis/qgsapplication.h&gt;
  #include &lt;qgis/qgsproviderregistry.h&gt;
  #include &lt;qgis/qgssinglesymbolrenderer.h&gt;
  #include &lt;qgis/qgsmaplayerregistry.h&gt;
  #include &lt;qgis/qgsvectorlayer.h&gt;
  #include &lt;qgis/qgsmapcanvas.h&gt;
  </code></pre>
  
  <p>As far as I searched, I am still unable to solve this problem. Please can anyone help me?</p>