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diff --git a/libstdc++-v3/testsuite/20_util/function_objects/comparisons.cc b/libstdc++-v3/testsuite/20_util/function_objects/comparisons.cc
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+// 2001-06-18  Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 20.3.3 Comparisons
+
+#include <functional>
+
+class gnu_obj
+{
+  int i;
+public:
+  gnu_obj(int arg = 0): i(arg) { }
+  bool operator==(const gnu_obj& rhs) const { return i == rhs.i; }
+  bool operator!=(const gnu_obj& rhs) const { return i != rhs.i; }
+  bool operator<(const gnu_obj& rhs) const { return i < rhs.i; }
+};
+
+template<typename T>
+  struct gnu_t
+  {
+    bool b;
+  public:
+    gnu_t(bool arg = 0): b(arg) { }
+    bool operator==(const gnu_t& rhs) const { return b == rhs.b; }
+    bool operator!=(const gnu_t& rhs) const { return b != rhs.b; }
+    bool operator<(const gnu_t& rhs) const { return b == rhs.b; }
+  };
+
+template struct std::not_equal_to<void*>;
+template struct std::not_equal_to<gnu_obj>;
+template struct std::not_equal_to<gnu_t<long> >;
+
+int main() 
+{ 
+  return 0;
+}