there is SOCKS support these days

docs/FAQ

-Updated: November 20, 2002 (http://curl.haxx.se/docs/faq.html)
+Updated: January 13, 2003 (http://curl.haxx.se/docs/faq.html)
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@@ -275,8 +275,8 @@ FAQ
 
   2.4. Does cURL support Socks (RFC 1928) ?
 
-  No. Nobody has wanted it that badly yet. We appreciate patches that bring
-  this functionality.
+  There is limited support for SOCKS5 for curl built with IPv6 support
+  disabled.
 
 
 3. Usage problems