--- a/src/config.h
+++ b/src/config.h
-@@ -257,8 +257,9 @@ NOTES:
+@@ -269,8 +269,9 @@ NOTES:
/* We assume that systems which don't have IPv6
headers don't have ntop and pton either */
-#if defined(INET6_ADDRSTRLEN) && defined(IPV6_V6ONLY) && !defined(NO_IPV6)
+#if defined(INET6_ADDRSTRLEN) && !defined(NO_IPV6)
# define HAVE_IPV6
-+# define IPV6_V6ONLY 26
++# define IPV6_V6ONLY 26
# define ADDRSTRLEN INET6_ADDRSTRLEN
# if defined(SOL_IPV6)
# define IPV6_LEVEL SOL_IPV6