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diff --git a/libstdc++-v3/include/ext/rb_tree b/libstdc++-v3/include/ext/rb_tree
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+++ b/libstdc++-v3/include/ext/rb_tree
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+// rb_tree extension -*- C++ -*-
+
+// Copyright (C) 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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 3, or (at your option)
+// any later version.
+
+// This 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 General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+/*
+ *
+ * Copyright (c) 1994
+ * Hewlett-Packard Company
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Hewlett-Packard Company makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ *
+ * Copyright (c) 1996
+ * Silicon Graphics Computer Systems, Inc.
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Silicon Graphics makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ */
+
+/** @file ext/rb_tree
+ *  This file is a GNU extension to the Standard C++ Library (possibly
+ *  containing extensions from the HP/SGI STL subset). 
+ */
+
+#ifndef _RB_TREE
+#define _RB_TREE 1
+
+#pragma GCC system_header
+
+#include <bits/stl_tree.h>
+
+namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+  using std::_Rb_tree;
+  using std::allocator;
+
+  // Class rb_tree is not part of the C++ standard.  It is provided for
+  // compatibility with the HP STL.
+
+  /**
+   *  This is an SGI extension.
+   *  @ingroup SGIextensions
+   *  @doctodo
+   */
+  template <class _Key, class _Value, class _KeyOfValue, class _Compare,
+	    class _Alloc = allocator<_Value> >
+    struct rb_tree
+    : public _Rb_tree<_Key, _Value, _KeyOfValue, _Compare, _Alloc>
+    {
+      typedef _Rb_tree<_Key, _Value, _KeyOfValue, _Compare, _Alloc> _Base;
+      typedef typename _Base::allocator_type allocator_type;
+
+      rb_tree(const _Compare& __comp = _Compare(),
+	      const allocator_type& __a = allocator_type())
+      : _Base(__comp, __a) { }
+
+      ~rb_tree() { }
+    };
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace
+
+#endif