Index: xtables-addons-1.42/extensions/xt_ECHO.c
===================================================================
--- xtables-addons-1.42.orig/extensions/xt_ECHO.c	2012-08-12 20:33:11.000000000 +0200
+++ xtables-addons-1.42/extensions/xt_ECHO.c	2012-08-12 20:33:24.000000000 +0200
@@ -20,6 +20,7 @@
 #include <net/ip.h>
 #include <net/ip6_route.h>
 #include <net/route.h>
+#include <net/ip6_checksum.h>
 #include "compat_xtables.h"
 
 static unsigned int