double cvGetGLCMDescriptor(CvGLCM* GLCM, int step, int descriptor) {
    void *fptr;
    double retval;

    fptr = dlsym(_Chcv_handle, "cvGetGLCMDescriptor_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return -1;
    }
    dlrunfun(fptr, &retval, cvGetGLCMDescriptor, GLCM, step, descriptor);
    return retval;
}