#include <QtGui>
#include <QGLWidget>
#include <QtOpenGL>

class GLWidget : public QGLWidget
{
public:
    GLWidget(QWidget *parent = 0, QGLWidget *shareWidget = 0)
        : QGLWidget(parent, shareWidget) {}

    QSize minimumSizeHint() const { return QSize(50, 50);}
    QSize sizeHint() const { return QSize(200, 200); }

protected:
    void paintGL()
    {
        qglClearColor(Qt::green);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    }
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    QWidget w;
    QHBoxLayout *hL = new QHBoxLayout(&w);
    hL->addWidget(new GLWidget);
    w.show();
    return app.exec();
}