CvGraphScanner* cvCreateGraphScanner(CvGraph* graph, CvGraphVtx* vtx, int mask) {
    void *fptr;
    CvGraphScanner*retval;

    fptr = dlsym(_Chcv_handle, "cvCreateGraphScanner_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return NULL;
    }
    dlrunfun(fptr, &retval, cvCreateGraphScanner, graph, vtx, mask);
    return retval;
}
