curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, ascent_curl_callback);
curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, ascent_curl_error);
curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, ascent_curl_callback);
curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, ascent_curl_error);