---------------dummykmainwindow.h (in Qt-only version only)-----------------

class DLL_IMP_EXP_QEXTMDICLASS KMainWindow : public QMainWindow
{
   Q_OBJECT
public:
   KMainWindow( QWidget* parentWidget = 0L, const char* name = "", WFlags flags = WType_TopLevel) : QMainWindow( parentWidget, name, flags) {};
   ~KMainWindow() {};
};

-----------------kdockwidget.h----------------------------------------------

#ifndef NO_KDE2
# include <kmainwindow.h>
# undef  EXPORT_DOCKCLASS
# define EXPORT_DOCKCLASS
#else
# include <qmainwindow.h>
# include "dummykmainwindow.h"
# include "exportdockclass.h"
#endif

class EXPORT_DOCKCLASS KDockMainWindow : public KMainWindow
{
...
#ifdef NO_KDE2
   QMenuBar                *m_pMainMenuBar;
#else
   KMenuBar                *m_pMainMenuBar;
#endif
...
};

----------------main.cpp------------------------------------------------

#ifndef NO_KDE2
 #include <kapp.h>
 KApplication* theApp;
#else
 #include <qapplication.h>
 QApplication* theApp;
#endif

int main( int argc, char **argv )
{
#ifndef NO_KDE2
   KApplication a(argc,argv,"KFourChildren");
#else
   QApplication a(argc,argv);
#endif
   theApp = &a;

   KDockMainWindow* mainWdg = new.....
   a.setMainWidget( mainWdg );
   mainWdg->show();
   return a.exec();
}