diff --git a/include/Makefile b/include/Makefile
index fb93283ffbdf..70f52e05874a 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -1,4 +1,4 @@
-#	$NetBSD: Makefile,v 1.107 2003/01/19 19:24:39 thorpej Exp $
+#	$NetBSD: Makefile,v 1.108 2003/01/20 20:09:50 christos Exp $
 #	@(#)Makefile	8.2 (Berkeley) 1/4/94
 
 # Doing a make includes builds /usr/include
@@ -16,11 +16,11 @@ INCS=	a.out.h ar.h assert.h bitstring.h bm.h cpio.h ctype.h db.h dirent.h \
 	memory.h mpool.h ndbm.h netconfig.h netdb.h netgroup.h nlist.h \
 	nl_types.h \
 	nsswitch.h paths.h pwd.h ranlib.h re_comp.h regex.h regexp.h \
-	resolv.h rmd160.h rmt.h sa.h sched.h search.h setjmp.h sgtty.h sha1.h \
-	signal.h stab.h stddef.h stdio.h stdlib.h string.h strings.h \
-	stringlist.h struct.h sysexits.h tar.h threadlib.h time.h ttyent.h \
-	tzfile.h ucontext.h ulimit.h unistd.h util.h utime.h utmp.h utmpx.h \
-	vis.h wchar.h wctype.h
+	resolv.h rmd160.h rmt.h sa.h sched.h search.h semaphore.h setjmp.h \
+	sgtty.h sha1.h signal.h stab.h stddef.h stdio.h stdlib.h string.h \
+	strings.h stringlist.h struct.h sysexits.h tar.h threadlib.h time.h \
+	ttyent.h tzfile.h ucontext.h ulimit.h unistd.h util.h utime.h utmp.h \
+	utmpx.h vis.h wchar.h wctype.h
 INCS+=	arpa/ftp.h arpa/inet.h arpa/nameser.h arpa/telnet.h arpa/tftp.h
 INCS+=	protocols/dumprestore.h protocols/routed.h protocols/rwhod.h \
 	protocols/talkd.h protocols/timed.h
diff --git a/include/semaphore.h b/include/semaphore.h
new file mode 100644
index 000000000000..c6cdd83edc29
--- /dev/null
+++ b/include/semaphore.h
@@ -0,0 +1,61 @@
+/* $NetBSD: semaphore.h,v 1.1 2003/01/20 20:09:50 christos Exp $ */
+
+/*-
+ * Copyright (c) 2003 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Christos Zoulas.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#ifndef _SEMAPHORE_H_
+#define _SEMAPHORE_H_
+
+/* POSIX 1003.1b semaphores */
+
+struct _sem_st;
+typedef	struct _sem_st *sem_t;
+
+#define	SEM_FAILED	((sem_t *)0)
+#define	SEM_VALUE_MAX	(~0U)
+
+__BEGIN_DECLS
+int	 sem_close(sem_t *);
+int	 sem_destroy(sem_t *);
+int	 sem_getvalue(sem_t * __restrict, int * __restrict);
+int	 sem_init(sem_t *, int, unsigned int);
+int	 sem_post(sem_t *);
+int	 sem_trywait(sem_t *);
+int	 sem_unlink(const char *);
+int	 sem_wait(sem_t *);
+sem_t	*sem_open(const char *, int, ...);
+__END_DECLS
+
+#endif /* !_SEMAPHORE_H_ */