CvSubdiv2DPointLocation cvSubdiv2DLocate(CvSubdiv2D* subdiv, CvPoint2D32f pt, CvSubdiv2DEdge* edge, CvSubdiv2DPoint** vertex) {
    void *fptr;
    CvSubdiv2DPointLocation retval;

    fptr = dlsym(_Chcv_handle, "cvSubdiv2DLocate_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return -1;
    }
    dlrunfun(fptr, &retval, cvSubdiv2DLocate, subdiv, pt, edge, vertex);
    return retval;
}
