fatal error: QtGui/QApplication: No such file or directory

Question

I'm using Qt Creator, and this line is generated automatically by the Qt Creator:

#include <QtGui/QApplication>

But, why am I getting this message?

QtGui/QApplication: No such file or directory

Answer 1

Depending on the Qt-version (5) QtGui was moved to QtWidgets; so it becomes

#include <QtWidgets/QApplication>

Answer 2

You can try to add 'declarative' to the Project file:

QT += gui declarative

then

#include <QApplication>

It helps me