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diff --git a/lib/posixver.c b/lib/posixver.c
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+/* Which POSIX version to conform to, for utilities.
+
+ Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+/* Written by Paul Eggert. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include "posixver.h"
+
+#include <limits.h>
+#include <stdlib.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifndef _POSIX2_VERSION
+# define _POSIX2_VERSION 0
+#endif
+
+#ifndef DEFAULT_POSIX2_VERSION
+# define DEFAULT_POSIX2_VERSION _POSIX2_VERSION
+#endif
+
+/* The POSIX version that utilities should conform to. The default is
+ specified by the system. */
+
+int
+posix2_version (void)
+{
+ long int v = DEFAULT_POSIX2_VERSION;
+ char const *s = getenv ("_POSIX2_VERSION");
+
+ if (s && *s)
+ {
+ char *e;
+ long int i = strtol (s, &e, 10);
+ if (! *e)
+ v = i;
+ }
+
+ return v < INT_MIN ? INT_MIN : v < INT_MAX ? v : INT_MAX;
+}