diff --git a/sys/conf/Makefile.i386 b/sys/conf/Makefile.i386
index d8d19794bcc..8b7c43556dc 100644
--- a/sys/conf/Makefile.i386
+++ b/sys/conf/Makefile.i386
@@ -1,6 +1,6 @@
 # Copyright 1990 W. Jolitz
 #	from: @(#)Makefile.i386	7.1 5/10/91
-#	$Id: Makefile.i386,v 1.56 1995/03/01 10:08:04 gibbs Exp $
+#	$Id: Makefile.i386,v 1.57 1995/03/04 03:24:06 davidg Exp $
 #
 # Makefile for FreeBSD
 #
@@ -25,10 +25,11 @@ S=	../..
 .endif
 I386=	${S}/i386
 
-CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls
+CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit
 #
 # The following flags are next up for working on:
-# -Wimplicit -Wnested-externs 
+#	-Wnested-externs (almost works)
+#	-Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
 #
 # When working on removing warnings from code, the `-Werror' flag should be
 # of material assistance.
diff --git a/sys/conf/Makefile.powerpc b/sys/conf/Makefile.powerpc
index d8d19794bcc..8b7c43556dc 100644
--- a/sys/conf/Makefile.powerpc
+++ b/sys/conf/Makefile.powerpc
@@ -1,6 +1,6 @@
 # Copyright 1990 W. Jolitz
 #	from: @(#)Makefile.i386	7.1 5/10/91
-#	$Id: Makefile.i386,v 1.56 1995/03/01 10:08:04 gibbs Exp $
+#	$Id: Makefile.i386,v 1.57 1995/03/04 03:24:06 davidg Exp $
 #
 # Makefile for FreeBSD
 #
@@ -25,10 +25,11 @@ S=	../..
 .endif
 I386=	${S}/i386
 
-CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls
+CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit
 #
 # The following flags are next up for working on:
-# -Wimplicit -Wnested-externs 
+#	-Wnested-externs (almost works)
+#	-Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
 #
 # When working on removing warnings from code, the `-Werror' flag should be
 # of material assistance.
diff --git a/sys/i386/conf/Makefile.i386 b/sys/i386/conf/Makefile.i386
index d8d19794bcc..8b7c43556dc 100644
--- a/sys/i386/conf/Makefile.i386
+++ b/sys/i386/conf/Makefile.i386
@@ -1,6 +1,6 @@
 # Copyright 1990 W. Jolitz
 #	from: @(#)Makefile.i386	7.1 5/10/91
-#	$Id: Makefile.i386,v 1.56 1995/03/01 10:08:04 gibbs Exp $
+#	$Id: Makefile.i386,v 1.57 1995/03/04 03:24:06 davidg Exp $
 #
 # Makefile for FreeBSD
 #
@@ -25,10 +25,11 @@ S=	../..
 .endif
 I386=	${S}/i386
 
-CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls
+CWARNFLAGS?=-W -Wreturn-type -Wcomment -Wredundant-decls -Wimplicit
 #
 # The following flags are next up for working on:
-# -Wimplicit -Wnested-externs 
+#	-Wnested-externs (almost works)
+#	-Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations
 #
 # When working on removing warnings from code, the `-Werror' flag should be
 # of material assistance.