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diff --git a/gnu/hash.h b/gnu/hash.h
index 98f965d0..afe8dd31 100644
--- a/gnu/hash.h
+++ b/gnu/hash.h
@@ -1,7 +1,7 @@
 /* -*- buffer-read-only: t -*- vi: set ro: */
 /* DO NOT EDIT! GENERATED AUTOMATICALLY! */
 /* hash - hashing table processing.
-   Copyright (C) 1998-1999, 2001, 2003, 2009-2010 Free Software Foundation,
+   Copyright (C) 1998-1999, 2001, 2003, 2009-2011 Free Software Foundation,
    Inc.
    Written by Jim Meyering <meyering@ascend.com>, 1998.
 
@@ -29,15 +29,12 @@
 # include <stdio.h>
 # include <stdbool.h>
 
-/* The warn_unused_result attribute appeared first in gcc-3.4.0 */
-# ifndef __attribute__
-#  if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
-#   define __attribute__(x)
-#  endif
-# endif
-
-# ifndef ATTRIBUTE_WUR
-#  define ATTRIBUTE_WUR __attribute__ ((__warn_unused_result__))
+/* The __attribute__ feature is available in gcc versions 2.5 and later.
+   The warn_unused_result attribute appeared first in gcc-3.4.0.  */
+# if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+#  define _GL_ATTRIBUTE_WUR __attribute__ ((__warn_unused_result__))
+# else
+#  define _GL_ATTRIBUTE_WUR /* empty */
 # endif
 
 typedef size_t (*Hash_hasher) (const void *, size_t);
@@ -83,13 +80,13 @@ size_t hash_string (const char *, size_t);
 void hash_reset_tuning (Hash_tuning *);
 Hash_table *hash_initialize (size_t, const Hash_tuning *,
                              Hash_hasher, Hash_comparator,
-                             Hash_data_freer) ATTRIBUTE_WUR;
+                             Hash_data_freer) _GL_ATTRIBUTE_WUR;
 void hash_clear (Hash_table *);
 void hash_free (Hash_table *);
 
 /* Insertion and deletion.  */
-bool hash_rehash (Hash_table *, size_t) ATTRIBUTE_WUR;
-void *hash_insert (Hash_table *, const void *) ATTRIBUTE_WUR;
+bool hash_rehash (Hash_table *, size_t) _GL_ATTRIBUTE_WUR;
+void *hash_insert (Hash_table *, const void *) _GL_ATTRIBUTE_WUR;
 int hash_insert0 (Hash_table *table, const void *entry,
                   const void **matched_ent);
 void *hash_delete (Hash_table *, const void *);