An Andres Garcia fix: add a typecast to make it work better

    /* and give the size of the upload (optional) */

    curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,

                     file_info.st_size);

                     (curl_off_t)file_info.st_size);

    /* Now run off and do what you've been told! */

    res = curl_easy_perform(curl);