--- Makefile
+++ Makefile	2013-12-03 08:14:47.362446079 +0000
@@ -46,7 +67,7 @@ SHELL		= /bin/sh
 
 # If you know that the IPv6 functions work on your machine, you can enable
 # them here.
-##IPv6		= -DHAVE_IPv6_FUNCS
+IPv6		= -DHAVE_IPv6_FUNCS
 
 #
 # Binaries are stripped with this command after installation.
--- fio.c
+++ fio.c	2013-12-03 08:55:19.158236784 +0000
@@ -1024,6 +1024,16 @@ sopen(const char *xserver, struct sock *
 	char	*cp;
 	char	*server = (char *)xserver;
 
+#ifdef	HAVE_IPv6_FUNCS
+	if ((cp = strchr(server, ']')) != NULL) {
+		if (cp[1] == ':') {
+			portstr = &cp[2];
+			server = salloc(cp+1 - xserver+1);
+			memcpy(server, xserver, cp+1 - xserver);
+			server[cp+1 - xserver] = '\0';
+		}
+	} else
+#endif  /* HAVE_IPv6_FUNCS */
 	if ((cp = strchr(server, ':')) != NULL) {
 		portstr = &cp[1];
 #ifndef	HAVE_IPv6_FUNCS