uchar* cvPtrND(CvArr* arr, int* idx, int* type, int create_node, unsigned* precalc_hashval) {
    void *fptr;
    uchar*retval;

    fptr = dlsym(_Chcv_handle, "cvPtrND_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return NULL;
    }
    dlrunfun(fptr, &retval, cvPtrND, arr, idx, type, create_node, precalc_hashval);
    return retval;
}
