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diff --git a/sysdeps/unix/sysv/irix4/sys/mman.h b/sysdeps/unix/sysv/irix4/sys/mman.h
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+++ b/sysdeps/unix/sysv/irix4/sys/mman.h
@@ -0,0 +1,101 @@
+/* Definitions for BSD-style memory management.  Irix 4 version.
+Copyright (C) 1994 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#ifndef	_SYS_MMAN_H
+
+#define	_SYS_MMAN_H	1
+#include <features.h>
+
+#include <gnu/types.h>
+#define __need_size_t
+#include <stddef.h>
+
+
+/* Protections are chosen from these bits, OR'd together.  The
+   implementation does not necessarily support PROT_EXEC or PROT_WRITE
+   without PROT_READ.  The only guarantees are that no writing will be
+   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
+
+#define	PROT_NONE	0x00	/* No access.  */
+#define	PROT_READ	0x04	/* Pages can be read.  */
+#define	PROT_WRITE	0x02	/* Pages can be written.  */
+#define	PROT_EXEC	0x01	/* Pages can be executed.  */
+#define	PROT_EXECUTE	PROT_EXEC
+
+
+/* Sharing types (must choose one and only one of these).  */
+#define	MAP_SHARED	0x01	/* Share changes.  */
+#define	MAP_PRIVATE	0x02	/* Changes private; copy pages on write.  */
+#define	MAP_TYPE	0x0f	/* Mask for sharing type.  */
+
+/* Other flags.  */
+#define	MAP_FIXED	0x10	/* Map address must be exactly as requested. */
+#define	MAP_RENAME	0x20	/* Rename private pages to file.  */
+#define	MAP_AUTOGROW	0x40	/* Grow file as pages are written.  */
+#define	MAP_LOCAL	0x80	/* Copy the mapped region on fork.  */
+
+/* Advice to `madvise'.  */
+#define	MADV_NORMAL	0	/* No further special treatment.  */
+#define	MADV_RANDOM	1	/* Expect random page references.  */
+#define	MADV_SEQUENTIAL	2	/* Expect sequential page references.  */
+#define	MADV_WILLNEED	3	/* Will need these pages.  */
+#define	MADV_DONTNEED	4	/* Don't need these pages.  */
+
+/* Flags to `msync'.  */
+#define	MS_ASYNC	0x1		/* Return immediately, don't fsync.  */
+#define	MS_INVALIDATE	0x2		/* Invalidate caches.  */
+
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+/* Map addresses starting near ADDR and extending for LEN bytes.  from
+   OFFSET into the file FD describes according to PROT and FLAGS.  If ADDR
+   is nonzero, it is the desired mapping address.  If the MAP_FIXED bit is
+   set in FLAGS, the mapping will be at ADDR exactly (which must be
+   page-aligned); otherwise the system chooses a convenient nearby address.
+   The return value is the actual mapping address chosen or (caddr_t) -1
+   for errors (in which case `errno' is set).  A successful `mmap' call
+   deallocates any previous mapping for the affected region.  */
+
+__caddr_t mmap __P ((__caddr_t __addr, size_t __len,
+		     int __prot, int __flags, int __fd, __off_t __offset));
+
+/* Deallocate any mapping for the region starting at ADDR and extending LEN
+   bytes.  Returns 0 if successful, -1 for errors (and sets errno).  */
+int munmap __P ((__caddr_t __addr, size_t __len));
+
+/* Change the memory protection of the region starting at ADDR and
+   extending LEN bytes to PROT.  Returns 0 if successful, -1 for errors
+   (and sets errno).  */
+int mprotect __P ((__caddr_t __addr, size_t __len, int __prot));
+
+/* Synchronize the region starting at ADDR and extending LEN bytes with the
+   file it maps.  Filesystem operations on a file being mapped are
+   unpredictable before this is done.  */
+int msync __P ((caddr_t __addr, size_t __len, int __flags));
+
+/* Advise the system about particular usage patterns the program follows
+   for the region starting at ADDR and extending LEN bytes.  */
+int madvise __P ((__caddr_t __addr, size_t __len, int __advice));
+
+__END_DECLS
+
+
+#endif	/* sys/mman.h */