Can not use QGLWidget.

[Teuniz]

I installed Qt 4.3.1 as follows:

./configure -static -release -no-qt3support -qt-zlib -qt-gif -qt-libpng -qt-libmng -qt-libjpeg -qt-libtiff -nomake demos -nomake examples

make
su
make install

I can create Qt programs but using QGLWidget gives an error message during compiling. It seems
that the include files for QtOpenGL are not installed in /usr/local/Trolltech/Qt-4.3.1/include.

In my opinion this is weird because according to the output of "./configure --help" openGL is installed by default.

Does anybody know what went wrong here?

[wysota]

Do you have QT+=opengl to your .pro file?

[Teuniz]

Do you have QT+=opengl to your .pro file?

Yes, I have.
But that's not the problem. The problem is that there are no headerfiles in my Qt dir, like Qt was installed with the option "-no-opengl".

When you decompress the tarbal after downloading Qt from Trolltech, there is a dir /home/teuniz/software/Qt/qt-x11-opensource-src-4.3.1/include/QtOpenGL with all the necesary headerfiles.

After installing Qt, when I look in the dir /usr/local/Trolltech/Qt-4.3.1/include there are only the subdir's:
Qt
QtCore
QtGui
QtNetwork
QtScript
QtSql
QtSvg
QtXml

My question is: Why does the cmd "make install" copy all the necessary dirs containing the headerfiles except for the dir QtOpenGL?
I did not use the option "-no-opengl" when configuring Qt.

Regards.

[wysota]

When you run configure at some point it reports which parts of the framework will be built (it's a list of features with yes/no/plugin values). Check whether the GL module is there with a "yes". It might be that you're missing OpenGL headers and Qt compilation script detects that and avoids building the module.