qt5base-lts/examples/opengl/cube/main.cpp

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#include <QApplication>
#include <QLabel>

#ifndef QT_NO_OPENGL
#include "mainwidget.h"
#endif

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    app.setApplicationName("cube");
    app.setApplicationVersion("0.1");
#ifndef QT_NO_OPENGL
    MainWidget widget;
    widget.show();
#else
    QLabel note("OpenGL Support required");
    note.show();
#endif
    return app.exec();
}