Description of problem:
Sixxs is a huge IPv6 supporting organisation which runs an own whois server
for the IPv6 blocks which are assigned to users and people using Sixxs. And
it IMHO makes sense to query Sixxs whois server directly for such blocks as
they're providing much more details about the owner/admin rather regular RIRs
such as RIPE, ARIN etc.

Version-Release number of selected component (if applicable):
jwhois-4.0-10

How reproducible:
Everytime.

Actual and expected results:
Add following before "Experimental IPv6 network 6bone (RFC2471)" in
cidr6-blocks { } in /etc/jwhois.conf:

--- snipp ---
       #
       # IPv6 blocks by carriers used for SixXS;
       # see e.g. http://www.sixxs.net/pops/
       #
       "2001:0610::/32" = "whois.sixxs.net";
       "2001:06A0::/32" = "whois.sixxs.net";
       "2001:06A8::/32" = "whois.sixxs.net";
       "2001:06F8::/32" = "whois.sixxs.net";
       "2001:0770::/32" = "whois.sixxs.net";
       "2001:07B8::/32" = "whois.sixxs.net";
       "2001:0808::/32" = "whois.sixxs.net";
       "2001:0838::/32" = "whois.sixxs.net";
       "2001:0960::/32" = "whois.sixxs.net";
       "2001:0A60::/32" = "whois.sixxs.net";
       "2001:0AD0::/32" = "whois.sixxs.net";
       "2001:0B18::/32" = "whois.sixxs.net";
       "2001:1418::/32" = "whois.sixxs.net";
       "2001:14B8::/32" = "whois.sixxs.net";
       "2001:15C0::/32" = "whois.sixxs.net";
       "2001:16D8::/32" = "whois.sixxs.net";
       "2001:1938::/32" = "whois.sixxs.net";
       "2001:4830::/32" = "whois.sixxs.net";
       "2001:4978::/32" = "whois.sixxs.net";
       "2001:41E0::/32" = "whois.sixxs.net";
       "2001:4428::/32" = "whois.sixxs.net";
       "2A01:0198::/32" = "whois.sixxs.net";
       "2A01:0348::/32" = "whois.sixxs.net";
--- snapp ---

And add following at server-options {} 

--- snipp ---
       "whois\\.sixxs\\.net" {
               whois-redirect = ".*ReferralServer: whois:\/\/\\(.*\\)";
       }
--- snapp ---

And add following at the end of handles {}

--- snipp ---
       ".*-SIXXS$" = "whois.sixxs.net";
--- snapp ---

Additional info:
Please try to get this fix upstream - upstream is unluckily always very very
unresponsive to me.