// libc might (via Avahi, etc) and use cgo.
					return hostLookupCgo, dnsConf
				}

				// We don't parse mdns.allow files. They're rare. If one
				// exists, it might list other TLDs (besides .local) or even
				// '*', so just let libc deal with it.
				var haveMDNSAllow bool
				switch c.mdnsTest {
				case mdnsFromSystem:
					_, err := os.Stat("/etc/mdns.allow")