diff --git a/usr.bin/ftp/Makefile b/usr.bin/ftp/Makefile
index 25d30d476e99..c2fe59cd4b1f 100644
--- a/usr.bin/ftp/Makefile
+++ b/usr.bin/ftp/Makefile
@@ -2,6 +2,8 @@
 #	$NetBSD: Makefile,v 1.15 1997/10/18 15:31:20 lukem Exp $
 #	from: @(#)Makefile	8.2 (Berkeley) 4/3/94
 
+.include <bsd.own.mk>
+
 # Uncomment the following to provide defaults for gate-ftp operation
 #
 #CFLAGS+=-DGATE_SERVER=\"ftp-gw.host\" # -DGATE_PORT=21
@@ -13,7 +15,11 @@ PROG=	ftp
 SRCS=	cmds.c cmdtab.c complete.c domacro.c fetch.c ftp.c main.c progressbar.c \
 	ruserpass.c util.c
 
-CFLAGS+=-I${.CURDIR} -I${LUKEMFTP} -DINET6
+.if ${MK_INET6_SUPPORT} != "no"
+CFLAGS+= -DINET6
+.endif
+
+CFLAGS+= -I${.CURDIR} -I${LUKEMFTP}
 LDADD=	-ledit -ltermcap -lutil
 DPADD=	${LIBEDIT} ${LIBTERMCAP} ${LIBUTIL}
 
diff --git a/usr.bin/logger/Makefile b/usr.bin/logger/Makefile
index 48c52513500d..922192ce919f 100644
--- a/usr.bin/logger/Makefile
+++ b/usr.bin/logger/Makefile
@@ -1,7 +1,12 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
 # $FreeBSD$
 
+.include <bsd.own.mk>
+
 PROG=	logger
-CFLAGS+=-DINET6
+
+.if ${MK_INET6_SUPPORT} != "no"
+CFLAGS+= -DINET6
+.endif
 
 .include <bsd.prog.mk>
diff --git a/usr.bin/systat/Makefile b/usr.bin/systat/Makefile
index 3cd09f4b50a4..4f5f229725b6 100644
--- a/usr.bin/systat/Makefile
+++ b/usr.bin/systat/Makefile
@@ -1,12 +1,19 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
 # $FreeBSD$
 
+.include <bsd.own.mk>
+
 PROG=	systat
 SRCS=	cmds.c cmdtab.c devs.c fetch.c iostat.c keyboard.c main.c \
-	mbufs.c netcmds.c netstat.c pigs.c swap.c icmp.c icmp6.c \
-	mode.c ip.c ip6.c tcp.c \
+	mbufs.c netcmds.c netstat.c pigs.c swap.c icmp.c \
+	mode.c ip.c tcp.c \
 	vmstat.c convtbl.c ifcmds.c ifstat.c
-CFLAGS+=-DINET6
+
+.if ${MK_INET6_SUPPORT} != "no"
+SRCS+=	icmp6.c ip6.c
+CFLAGS+= -DINET6
+.endif
+
 DPADD=	${LIBCURSES} ${LIBM} ${LIBDEVSTAT} ${LIBKVM}
 LDADD=	-lcurses -lm -ldevstat -lkvm