diff --git a/sys/modules/netgraph/checksum/Makefile b/sys/modules/netgraph/checksum/Makefile
index 88f48441c81..4aa64c70e5c 100644
--- a/sys/modules/netgraph/checksum/Makefile
+++ b/sys/modules/netgraph/checksum/Makefile
@@ -1,20 +1,9 @@
 # $FreeBSD$
 
-.include <bsd.own.mk>
+SYSDIR?=${SRCTOP}/sys
+.include "${SYSDIR}/conf/kern.opts.mk"
 
 KMOD=	ng_checksum
 SRCS= 	ng_checksum.c opt_inet.h opt_inet6.h
 
-#.if !defined(KERNBUILDDIR)
-#
-#.if ${MK_INET_SUPPORT} != "no"
-#opt_inet.h:
-#	echo "#define INET 1" > ${.TARGET}
-#.endif
-#.if ${MK_INET6_SUPPORT} != "no"
-#opt_inet6.h:
-#	echo "#define INET6 1" > ${.TARGET}
-#.endif
-#.endif
-
 .include <bsd.kmod.mk>