--- sys/modules/hyperv/netvsc/Makefile	2015-08-16 12:58:59.313652000 +0700
+++ sys/modules/hyperv/netvsc/Makefile	2015-08-16 20:39:14.425403000 +0700
@@ -1,5 +1,7 @@ 
 # $FreeBSD: stable/10/sys/modules/hyperv/netvsc/Makefile 255923 2013-09-28 07:04:03Z uqs $
 
+.include <bsd.own.mk>
+
 .PATH:  ${.CURDIR}/../../../dev/hyperv/netvsc
 
 KMOD=	hv_netvsc
@@ -10,4 +12,18 @@ 
 
 CFLAGS+= -I${.CURDIR}/../../../dev/hyperv/netvsc
 
+.if !defined(KERNBUILDDIR)
+SRCS+=	opt_inet.h opt_inet6.h
+
+.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>