[SOLVED] Qt 4.8 library project with QWidget?

[postb99]

Hello,

I was given some C++ code from another team and have to write a tutorial from it.
They start with a C++ library project that contains Qt plugins implementations. I have troubles getting the following include to work:

@#include <QWidgets>@

I use MSVC 2010, Qt Creator 5.2.0, Qt 4.8.5. A Qt console app works.

In my .pro file, adding the folllowing doesn't help resolving the include:

@QT += widgets@

or

@QT += gui@

or both.

I've tested the following: create a library project and checking "QtWidgets" when asked which modules to include.

Then it adds to .pro file "QT += widgets" as first try above.

I strongly guess Qt Creator based itself on Qt5 modules names, since they're different in Qt 4.8 and 5. Because I've read here and there this code:

@greaterThan(QT_MAJOR_VERSION, 4): QT += widgets@

Thanks for pointers.

Edited: I'd like to avoid:
@#include <QtGui>@ as stated here: http://qt-project.org/doc/qt-4.8/mainwindows-dockwidgets.html
because I undestood it means loading a lot of maybe unneeded libs.

[postb99]

OK this thread helped me: http://qt-project.org/forums/viewthread/26070

So it's working with:

@QT += core gui@

@#include <QWidget>@ without final "s"!!

while for Qt5 you have to
@QT += core gui widgets@

@#include <QtWidgets>@ with additional "t" and "s"!

Why did they change so many things that newbies easily get confused? ^^