diff --git a/lib/Makefile b/lib/Makefile
index 35d317d4d856..1bd3cb269ef7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,6 +1,8 @@
-#	$NetBSD: Makefile,v 1.20 1996/05/12 04:30:18 mhitch Exp $
+#	$NetBSD: Makefile,v 1.21 1996/06/14 17:22:05 cgd Exp $
 #	from: @(#)Makefile	5.25.1.1 (Berkeley) 5/7/91
 
+.include <bsd.own.mk>			# for EXPORTABLE_SYSTEM definition
+
 SUBDIR=	csu libarch libc libcompat libcrypt libcurses libedit libl \
 	libm libpcap libresolv librpcsvc libskey libterm libutil liby
 
diff --git a/usr.bin/Makefile b/usr.bin/Makefile
index 4fc3bcc1c1ba..40bba9993727 100644
--- a/usr.bin/Makefile
+++ b/usr.bin/Makefile
@@ -1,6 +1,8 @@
-#	$NetBSD: Makefile,v 1.62 1996/03/10 05:45:43 thorpej Exp $
+#	$NetBSD: Makefile,v 1.63 1996/06/14 17:22:07 cgd Exp $
 #	from: @(#)Makefile	5.8.1.1 (Berkeley) 5/8/91
 
+.include <bsd.own.mk>			# for EXPORTABLE_SYSTEM definition
+
 SUBDIR=	apply apropos asa at banner basename bdes biff cal calendar cap_mkdb \
 	checknr chflags chpass cksum cmp col colcrt colrm column comm \
 	compress crontab ctags cut dirname du \
diff --git a/usr.bin/tn3270/tn3270/Makefile b/usr.bin/tn3270/tn3270/Makefile
index d43de1b0c9f7..2fa117c5448a 100644
--- a/usr.bin/tn3270/tn3270/Makefile
+++ b/usr.bin/tn3270/tn3270/Makefile
@@ -1,6 +1,7 @@
-#	$Id: Makefile,v 1.14 1996/06/09 16:09:56 jtk Exp $
+#	$Id: Makefile,v 1.15 1996/06/14 17:24:48 cgd Exp $
 
 .include "../../Makefile.inc"
+.include <bsd.own.mk>			# for EXPORTABLE_SYSTEM definition
 
 CFLAGS += -I${.CURDIR} -I.
 .if !defined(EXPORTABLE_SYSTEM) && exists(${.CURDIR}/../../../domestic/lib/libtelnet)