Where is QOpenGLWidget?

[Tom asso]

I'm trying to write a C++ application that uses QOpenGLWidget, but qtcreator gives "'QOpenGLWidget' file not found" error on this line:

#include <QOpenGLWidget>

Documentation says QOpenGLWidget was introduced in Qt 5.4, and I believe I am running Qt 5.12; 'qmake --version' gives:

QMake version 3.1
Using Qt version 5.12.1 in /home/oreilly/Qt5.12.1/5.12.1/gcc_64/lib

What am I doing wrong?

Thanks
Tom

[kenchan]

@Tom-asso
What does you .pro file look like?

[JKSH]

Where is QOpenGLWidget?

It is in the Qt Widgets module. So if #include <QWidget> works, then #include <QOpenGLWidget> should also work.

Make sure your .pro file is set to use the Qt Widgets module (something like QT += widgets)

[Tom asso]

My .pro file had this entry:
QT += quick

I added the following:
QT += opengl

And now qtcreator finds QOpenGLWidget

Thanks
Tom

[SGaist]

Hi,

As @JKSH already wrote, you are missing QT += widgets in your .pro file.

[appas]

Just for anyone searching, in Qt6 you need to add

QT += openglwidgets

[finchren]

@appas Thank you, you saved me)