diff --git a/src/include/Makefile b/src/include/Makefile
index ba1164c3..e4e87ae8 100644
--- a/src/include/Makefile
+++ b/src/include/Makefile
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.70 1999/07/01 21:41:32 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.71 1999/09/24 22:33:10 espie Exp $
 #	$NetBSD: Makefile,v 1.59 1996/05/15 21:36:43 jtc Exp $
 
 #	@(#)Makefile	5.45.1.1 (Berkeley) 5/6/91
@@ -15,7 +15,7 @@ FILES=	a.out.h ar.h assert.h bitstring.h blf.h bm.h cast.h cpio.h ctype.h \
 	memory.h mpool.h ndbm.h netdb.h netgroup.h nlist.h nl_types.h \
 	olf_abi.h paths.h poll.h pwd.h ranlib.h re_comp.h regex.h resolv.h \
 	rmd160.h search.h setjmp.h sgtty.h sha1.h skipjack.h signal.h stab.h \
-	stddef.h stdio.h stdlib.h string.h strings.h struct.h sysexits.h \
+	stdbool.h stddef.h stdio.h stdlib.h string.h strings.h struct.h sysexits.h \
 	tar.h time.h ttyent.h tzfile.h unistd.h utime.h utmp.h vis.h
 
 .if (${MACHINE_ARCH} != "alpha") && (${MACHINE_ARCH} != "mips") && \
diff --git a/src/include/stdbool.h b/src/include/stdbool.h
new file mode 100644
index 00000000..f2cd0a27
--- /dev/null
+++ b/src/include/stdbool.h
@@ -0,0 +1,21 @@
+/* $OpenBSD: stdbool.h,v 1.1 1999/09/24 22:33:10 espie Exp $ */
+#ifndef	_STDBOOL_H_
+#define	_STDBOOL_H_	
+
+/* `_Bool' type must promote to `int' or `unsigned int'. */
+typedef enum {
+	false = 0,
+	true = 1
+} _Bool;
+
+/* And those constants must also be available as macros. */
+#define	false	false
+#define	true	true
+
+/* User visible type `bool' is provided as a macro which may be redefined */
+#define bool _Bool
+
+/* Inform that everything is fine */
+#define __bool_true_false_are_defined 1
+
+#endif /* _STDBOOL_H_ */