var hasDNSSourceChecked bool

	var filesSource, dnsSource bool
	var first string
	for i, src := range srcs {
		if src.source == "files" || src.source == "dns" {
			if canUseCgo && !src.standardCriteria() {
				// non-standard; let libc deal with it.
				return hostLookupCgo, dnsConf
			}
			if src.source == "files" {
				filesSource = true
			} else {
				hasDNSSource = true