issue of including QtGui files in building a c++ based software

I am not expert in c++ and I am trying to install a software which is based on c++; during the building the files in Qt Creator, once it reaches to this line to include

#include <QtGui/QMainWindow>
#include <QtGui/QGraphicsSceneMouseEvent>

it shows error

/home/ubuntu/Ezys/source/Ezys_GUI/ezys_gui.h:12: error: QtGui/QMainWindow: No such file or directory
 #include <QtGui/QMainWindow>
                             ^

I checked the place of QtGui, which is /usr/include/qt4/QtGui and all files are there. I do not know what is the reason cannot find the files and include them. Could someone please help me? Thanks

Solution

I think you're using the wrong kit for your project in Qt Creator, probably one based on Qt 5. See if you have a kit for Qt 4 or create a new one, then reconfigure your project to use it.

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