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diff --git a/gnu/unsetenv.c b/gnu/unsetenv.c
index 5e028be7..c92884e8 100644
--- a/gnu/unsetenv.c
+++ b/gnu/unsetenv.c
@@ -1,6 +1,6 @@
/* -*- buffer-read-only: t -*- vi: set ro: */
/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
-/* Copyright (C) 1992, 1995-2002, 2005-2011 Free Software Foundation, Inc.
+/* Copyright (C) 1992, 1995-2002, 2005-2013 Free Software Foundation, Inc.
This file is part of the GNU C Library.
This program is free software: you can redistribute it and/or modify
@@ -16,12 +16,12 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see . */
-#include
-
/* Don't use __attribute__ __nonnull__ in this compilation unit. Otherwise gcc
optimizes away the name == NULL test below. */
#define _GL_ARG_NONNULL(params)
+#include
+
/* Specification. */
#include
@@ -38,7 +38,7 @@
#endif
#if _LIBC
-/* This lock protects against simultaneous modifications of `environ'. */
+/* This lock protects against simultaneous modifications of 'environ'. */
# include
__libc_lock_define_initialized (static, envlock)
# define LOCK __libc_lock_lock (envlock)
@@ -99,6 +99,13 @@ weak_alias (__unsetenv, unsetenv)
#else /* HAVE_UNSETENV */
# undef unsetenv
+# if !HAVE_DECL_UNSETENV
+# if VOID_UNSETENV
+extern void unsetenv (const char *);
+# else
+extern int unsetenv (const char *);
+# endif
+# endif
/* Call the underlying unsetenv, in case there is hidden bookkeeping
that needs updating beyond just modifying environ. */