CvSeq* cvPointSeqFromMat(int seq_kind, CvArr* mat, CvContour* contour_header, CvSeqBlock* block) {
    void *fptr;
    CvSeq*retval;

    fptr = dlsym(_Chcv_handle, "cvPointSeqFromMat_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return NULL;
    }
    dlrunfun(fptr, &retval, cvPointSeqFromMat, seq_kind, mat, contour_header, block);
    return retval;
}
