#include <QtOpenGL/qgl.h>
#ifndef QGL_H
class QGLWidget: public QWidget{
   /* Some contents are skipped to improve readability */
   public: void renderText(double x, double y, double z, class QString const & str, class QFont const & fnt = QFont::QFont(), int listBase = 2000);
   /* ... */
};
#endif // QGL_H