when it's really old. but no actual ports fallout in espie's build.
ok deraadt
-/* $OpenBSD: unistd.h,v 1.96 2014/12/11 23:05:38 tedu Exp $ */
+/* $OpenBSD: unistd.h,v 1.97 2014/12/13 20:42:41 tedu Exp $ */
/* $NetBSD: unistd.h,v 1.26.4.1 1996/05/28 02:31:51 mrg Exp $ */
/*-
#define _XOPEN_UNIX (-1)
/* Define the POSIX.2 version we target for compliance. */
-#define _POSIX2_VERSION 199212L
+#define _POSIX2_VERSION 200809L
/* the sysconf(3) variable values are part of the ABI */
-/* $OpenBSD: unistd.h,v 1.29 2013/08/14 05:26:14 guenther Exp $ */
+/* $OpenBSD: unistd.h,v 1.30 2014/12/13 20:42:41 tedu Exp $ */
/* $NetBSD: unistd.h,v 1.10 1994/06/29 06:46:06 cgd Exp $ */
/*
#define _POSIX_SYNC_IO (-1)
/* Define the POSIX.1 version we target for compliance. */
-#define _POSIX_VERSION 199009L
+#define _POSIX_VERSION 200809L
/* access function */
#define F_OK 0 /* test for existence of file */