((const struct sockaddr_in *)b)->sin_addr.s_addr);
}
-#if defined(IPPROTO_IPV6)
+#if HAVE_STRUCT_SOCKADDR_IN6
if (a->ss_family == AF_INET6) {
const uint8_t *s6_addr_a = ((const struct sockaddr_in6 *)a)->sin6_addr.s6_addr;
const uint8_t *s6_addr_b = ((const struct sockaddr_in6 *)b)->sin6_addr.s6_addr;