diff --git a/sbin/ipf/Makefile b/sbin/ipf/Makefile
index b21a622e72b..39a22b5d20c 100644
--- a/sbin/ipf/Makefile
+++ b/sbin/ipf/Makefile
@@ -7,7 +7,7 @@ MAN4=	ipf.4
 MAN5=	ipf.5
 MAN8=	ipf.8
 SRCS=	ipf.c parse.c opt.c facpri.c common.c
-CFLAGS+=-DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../contrib/ipfilter
+CFLAGS+=-DUSE_INET6 -DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../contrib/ipfilter
 
 MAINTAINER=	guido@freebsd.org
 
diff --git a/sbin/ipfstat/Makefile b/sbin/ipfstat/Makefile
index be7bde58e43..7a23800d6ba 100644
--- a/sbin/ipfstat/Makefile
+++ b/sbin/ipfstat/Makefile
@@ -5,7 +5,7 @@
 PROG=	ipfstat
 MAN8=	ipfstat.8
 SRCS=	fils.c parse.c opt.c kmem.c facpri.c common.c
-CFLAGS+=-DIPL_NAME=\"/dev/ipl\" -DSTATETOP -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
+CFLAGS+=-DUSE_INET6 -DIPL_NAME=\"/dev/ipl\" -DSTATETOP -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
 
 DPADD= ${NCURSES}
 LDADD= -lncurses
diff --git a/sbin/ipmon/Makefile b/sbin/ipmon/Makefile
index 9a078897b4e..9df9905a7ab 100644
--- a/sbin/ipmon/Makefile
+++ b/sbin/ipmon/Makefile
@@ -7,7 +7,7 @@ MAN4=	ipl.4
 MAN8=	ipmon.8
 SRCS=	ipmon.c
 
-CFLAGS+=-DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
+CFLAGS+=-DUSE_INET6 -DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
 
 MAINTAINER=	guido@freebsd.org
 
diff --git a/sbin/ipnat/Makefile b/sbin/ipnat/Makefile
index 35ab85bf8df..87f823997d8 100644
--- a/sbin/ipnat/Makefile
+++ b/sbin/ipnat/Makefile
@@ -8,7 +8,7 @@ MAN4=	ipnat.4
 MAN5=	ipnat.5
 MLINKS=	ipnat.5 ipnat.conf.5
 SRCS=	ipnat.c kmem.c natparse.c common.c
-CFLAGS+=-DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
+CFLAGS+=-DUSE_INET6 -DIPL_NAME=\"/dev/ipl\" -I- -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
 
 MAINTAINER=	guido@freebsd.org
 
diff --git a/usr.sbin/ipftest/Makefile b/usr.sbin/ipftest/Makefile
index 284236a570c..8d015b89835 100644
--- a/usr.sbin/ipftest/Makefile
+++ b/usr.sbin/ipftest/Makefile
@@ -10,7 +10,7 @@ SRCS=	opt_ipfilter.h \
 	ipft_tx.c misc.c ip_frag.c ip_state.c ip_nat.c ip_proxy.c \
 	ip_auth.c ipft_hx.c ip_fil.c natparse.c facpri.c common.c
 
-CFLAGS+=-DIPL_NAME=\"/dev/ipl\" -I- -I${.OBJDIR} -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
+CFLAGS+=-DUSE_INET6 -DIPL_NAME=\"/dev/ipl\" -I- -I${.OBJDIR} -I${.CURDIR}/../../sys/netinet -I${.CURDIR}/../../sys -I${.CURDIR}/../../contrib/ipfilter
 
 CLEANFILES+=	opt_ipfilter.h
 
diff --git a/usr.sbin/ipresend/Makefile b/usr.sbin/ipresend/Makefile
index 1313213e0d6..d7f33807d65 100644
--- a/usr.sbin/ipresend/Makefile
+++ b/usr.sbin/ipresend/Makefile
@@ -8,6 +8,7 @@ MAN1=	ipresend.1
 SRCS=	ipresend.c ip.c resend.c opt.c ipft_ef.c ipft_hx.c ipft_sn.c ipft_td.c ipft_tx.c sbpf.c 44arp.c ipft_pc.c
 
 CFLAGS+=-DDOSOCKET -DIPL_NAME=\"/dev/ipl\" \
+	-DUSE_INET6 \
 	-I- -I${.CURDIR}/../../sys/netinet \
 	-I${.CURDIR}/../../contrib/ipfilter/ipsend \
 	-I${.CURDIR}/../../contrib/ipfilter
diff --git a/usr.sbin/ipsend/Makefile b/usr.sbin/ipsend/Makefile
index 4b1b80e2264..f356fa8e0d2 100644
--- a/usr.sbin/ipsend/Makefile
+++ b/usr.sbin/ipsend/Makefile
@@ -11,6 +11,7 @@ SRCS=	ipsend.c ip.c ipsopt.c sbpf.c sock.c 44arp.c iplang_y.y iplang_l.l \
 	y.tab.h
 
 CFLAGS+=-DDOSOCKET -DIPL_NAME=\"/dev/ipl\" \
+	-DUSE_INET6 \
 	-I- -I. -I${.CURDIR}/../../sys/netinet \
 	-I${.CURDIR}/../../contrib/ipfilter/ipsend \
 	-I${.CURDIR}/../../contrib/ipfilter/iplang \
diff --git a/usr.sbin/iptest/Makefile b/usr.sbin/iptest/Makefile
index 9465369a380..b86e42f1fc4 100644
--- a/usr.sbin/iptest/Makefile
+++ b/usr.sbin/iptest/Makefile
@@ -8,6 +8,7 @@ MAN1=	iptest.1
 SRCS=	iptest.c iptests.c ip.c sbpf.c 44arp.c sock.c
 
 CFLAGS+=-DDOSOCKET -DIPL_NAME=\"/dev/ipl\" \
+	-DUSE_INET6 \
 	-I- -I${.CURDIR}/../../sys/netinet \
 	-I${.CURDIR}/../../contrib/ipfilter/ipsend \
 	-I${.CURDIR}/../../contrib/ipfilter