void icvGetNormalDirect(CvVect64d direct, CvPoint2D64f point, CvVect64d normDirect) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "icvGetNormalDirect_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, icvGetNormalDirect, direct, point, normDirect);
}
