schar* cvSeqSearch(CvSeq* seq, void* elem, CvCmpFunc func, int is_sorted, int* elem_idx, void* userdata) {
    void *fptr;
    schar*retval;

    fptr = dlsym(_Chcv_handle, "cvSeqSearch_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return NULL;
    }
    dlrunfun(fptr, &retval, cvSeqSearch, seq, elem, func, is_sorted, elem_idx, userdata);
    return retval;
}
