I added the configuring of curl to use c-ares. Basically a new USE flag "ares" is used to enable that facility. A new dependency is built in case, to net-dns/c-ares ipv6 and ares are incompatible, in that c-ares does not support ipv6
Created attachment 56276 [details] curl-7.13.1-r1.ebuild
added to 7.13-r2 but forgot to close this bug.