CV_IMPL int
cvCreateTrackbar( const char*, const char*,
                  int*, int, CvTrackbarCallback )
{
    CV_NO_GUI_ERROR( "cvCreateTrackbar" );
    return -1;
}

CV_IMPL int
cvCreateTrackbar2( const char* /*trackbar_name*/, const char* /*window_name*/,
                   int* /*val*/, int /*count*/, CvTrackbarCallback2 /*on_notify2*/,
                   void* /*userdata*/ )
{
    CV_NO_GUI_ERROR( "cvCreateTrackbar2" );
}

CV_IMPL int
cvCreateTrackbar2( const char* trackbar_name, const char* window_name,
                   int* val, int count, CvTrackbarCallback2 on_notify2,
                   void* userdata )
{
    CV_NO_GUI_ERROR( "cvCreateTrackbar2" );
    return -1;
}

CV_IMPL int cvInitSystem( int , char** )
{

    CV_NO_GUI_ERROR( "cvInitSystem" );
    return -1;
}

CV_IMPL int cvWaitKey( int )
{
    CV_NO_GUI_ERROR( "cvWaitKey" );
    return -1;
}

CV_IMPL const char* cvGetWindowName( void* )
{
    CV_NO_GUI_ERROR( "cvGetWindowName" );
    return 0;
}

CV_IMPL void* cvGetWindowHandle( const char* )
{
    CV_NO_GUI_ERROR( "cvGetWindowHandle" );
    return 0;
}

CV_IMPL int cvWaitKey( int )
{
    CV_NO_GUI_ERROR( "cvWaitKey" );
}

CV_IMPL void cvSaveWindowParameters(const char* )
{
    CV_NO_GUI_ERROR("cvSaveWindowParameters");
}

CV_IMPL void cvMoveWindow( const char*, int, int )
{
    CV_NO_GUI_ERROR( "cvMoveWindow" );
}

CV_IMPL void cvDisplayStatusBar(const char* , const char* , int )
{
    CV_NO_GUI_ERROR("cvDisplayStatusBar");
}

CV_IMPL void
cvDestroyAllWindows( void )
{
    CV_NO_GUI_ERROR( "cvDestroyAllWindows" );
}

CV_IMPL void
cvShowImage( const char*, const CvArr* )
{
    CV_NO_GUI_ERROR( "cvShowImage" );
}

CV_IMPL void cvDestroyWindow( const char* )
{
    CV_NO_GUI_ERROR( "cvDestroyWindow" );
}

CV_IMPL int cvNamedWindow( const char*, int )
{
    CV_NO_GUI_ERROR("cvNamedWindow");
    return -1;
}

CV_IMPL int cvInitSystem( int argc, char** argv )
{

    CV_NO_GUI_ERROR( "cvInitSystem" );
    return -1;
}

CV_IMPL int cvStartWindowThread()
{

    CV_NO_GUI_ERROR( "cvStartWindowThread" );
    return -1;
}

CV_IMPL int cvStartLoop(int (*)(int argc, char *argv[]), int , char* argv[])
{
    (void)argv;
    CV_NO_GUI_ERROR("cvStartLoop");
    return -1;
}

//-------- Qt ---------
CV_IMPL void cvAddText( const CvArr*, const char*, CvPoint , CvFont* )
{
    CV_NO_GUI_ERROR("cvAddText");
}

CV_IMPL int cvStartLoop(int (*)(int argc, char *argv[]), int , char* argv[])
{
    CV_UNUSED(argv);
    CV_NO_GUI_ERROR("cvStartLoop");
}