#include <QtGui/qregion.h>
#ifndef QREGION_H
class QRegion{
   /* Some contents are skipped to improve readability */
#if defined(Q_WS_WIN)
#elif defined(Q_WS_X11)
   private: void updateX11Region() const
#elif defined(Q_WS_MAC)
#elif defined(QT_EXPERIMENTAL_REGIONS)
#endif
   /* ... */
};
#endif // QREGION_H