Set socks proxy gssapi negotiation protection
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_GSSAPI_NEC, long nec);
Pass a long set to 1 to enable or 0 to disable. As part of the gssapi negotiation a protection mode is negotiated. The RFC1961 says in section 4.3/4.4 it should be protected, but the NEC reference implementation does not. If enabled, this option allows the unprotected exchange of the protection mode negotiation.
Added in 7.19.4
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.