i just found out that there is ipv6 support for privoxy (see https://sourceforge.net/tracker/index.php?func=detail&aid=649507&group_id=11118&atid=311118) and a patch already exists in privoxy cvs. since ipv6 is more and more common these days i think this should be added to the privoxy ebuild in gentoo.
Created attachment 105462 [details, diff] ipv6 patch for privoxy 3.0.6 this is the privoxy ipv6 patch from http://ijbswa.cvs.sourceforge.net/*checkout*/ijbswa/current/debian/patches/03_ipv6.dpatch?revision=1.5 the dpatch header was removed and it was modified to patch with privoxy-3.0.6-stable
Created attachment 105463 [details] modified privoxy ebuild with ipv6 USE-Flag
Won't do it because Debian dev Roland Rosenfeldfound that this patch has too many flaws (see http://packages.debian.org/changelogs/pool/main/p/privoxy/privoxy_3.0.6-2/changelog).