--- a/net.c
+++ b/net.c
@@ -320,9 +320,13 @@
   struct sockaddr_storage local;
   struct sockaddr_storage remote;
   struct sockaddr_in *local4 = (struct sockaddr_in *) &local;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 *local6 = (struct sockaddr_in6 *) &local;
+#endif
   struct sockaddr_in *remote4 = (struct sockaddr_in *) &remote;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 *remote6 = (struct sockaddr_in6 *) &remote;
+#endif
   socklen_t len;
 
   ttl = index + 1;
@@ -437,9 +441,13 @@
   struct sockaddr_storage local;
   struct sockaddr_storage remote;
   struct sockaddr_in *local4 = (struct sockaddr_in *) &local;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 *local6 = (struct sockaddr_in6 *) &local;
+#endif
   struct sockaddr_in *remote4 = (struct sockaddr_in *) &remote;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 *remote6 = (struct sockaddr_in6 *) &remote;
+#endif
   socklen_t len;
 
   ttl = index + 1;
@@ -726,8 +734,12 @@
 
   /* sendto() assumes packet length includes the IPv4 header but not the 
      IPv6 header. */
+#ifdef ENABLE_IPV6
   spacketsize = abs(packetsize)	-
 		( ( af == AF_INET ) ? 0 : sizeof (struct ip6_hdr) );
+#else
+  spacketsize = abs(packetsize);
+#endif
   rv = sendto(sendsock, packet, spacketsize, 0, remotesockaddr, salen);
   if (first && (rv < 0) && ((errno == EINVAL) || (errno == EMSGSIZE))) {
     /* Try the first packet again using host byte order. */
@@ -1535,11 +1547,15 @@
   struct sockaddr_in name_struct;
 #endif
   struct sockaddr_in *  sa4;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 * sa6;
+#endif
   struct sockaddr * name = (struct sockaddr *) &name_struct;
   struct sockaddr_storage remote;
   struct sockaddr_in *remote4 = (struct sockaddr_in *) &remote;
+#ifdef ENABLE_IPV6
   struct sockaddr_in6 *remote6 = (struct sockaddr_in6 *) &remote;
+#endif
   socklen_t len;
   int s;