Daniel Black's clarfication about the NTLM support

  4.9 Curl can't authenticate to the server that requires NTLM?

  This is supported in curl 7.10.6 or later. No earlier curl version knows

  of this magic.

  of this magic. Later versions require the OpenSSL or Microsoft Windows 

  libraries to provide this functionality. Using GnuTLS or NSS libraries will 

  not provide NTLM authentication functionality in curl.

  NTLM is a Microsoft proprietary protocol. Proprietary formats are evil. You

  should not use such ones.