"mdns4_mininal" on Ubuntu). This is a fix for NIXPKGS-79. It
doesn't *quite* fix the problem in all cases (there might be people
actually using mDNS; they should just run the "nscd" daemon) but at
least it should keep curl from failing in Nixpkgs downloads.
svn path=/nixpkgs/branches/stdenv-updates/; revision=11487