Deprecate using NET_C without HAVE_IPV6
diff --git a/configs/config-psk-rc4-tls1_0.h b/configs/config-psk-rc4-tls1_0.h
index b8113ea..2f557c1 100644
--- a/configs/config-psk-rc4-tls1_0.h
+++ b/configs/config-psk-rc4-tls1_0.h
@@ -12,7 +12,7 @@
#define POLARSSL_CONFIG_H
/* System support */
-//#define POLARSSL_HAVE_IPV6 /* Optional */
+#define POLARSSL_HAVE_IPV6 /* Now mandatory for NET_C */
//#define POLARSSL_HAVE_TIME /* Optionnaly used in Hello messages */
/* Other POLARSSL_HAVE_XXX flags irrelevant for this configuration */