args: ( args.mkDerivationByConfiguration { flagConfig = { mandatory = { buildInputs = [ "perl" ]; }; # many options I don't know wether they should be default .. }; extraAttrs = co : { name = "squid-3.0-stable5"; src = args.fetchurl { url = http://www.squid-cache.org/Versions/v3/HEAD/squid-3.HEAD-20080424.tar.bz2; sha256 = "0mqjq8112rjgn3nbpkg8iql32cnk5kiw8fmhj5gbqzbycbhaxjgz"; }; configureFlags = ["--enable-ipv6"]; meta = { description = "http-proxy"; homepage = "http://www.squid-cache.org"; license = "GPL2"; }; }; } ) args