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diff --git a/ACE/apps/gperf/src/Hash_Table.h b/ACE/apps/gperf/src/Hash_Table.h
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+++ b/ACE/apps/gperf/src/Hash_Table.h
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+// -*- C++ -*-
+
+/**
+ * $Id$
+ *
+ * Copyright (C) 1989 Free Software Foundation, Inc.
+ * written by Douglas C. Schmidt (schmidt@cs.wustl.edu)
+ *
+ * This file is part of GNU GPERF.
+ *
+ * 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
+ * of the License, 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.
+ */
+
+#ifndef HASH_TABLE_H
+#define HASH_TABLE_H
+
+#include "ace/config-all.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "Options.h"
+#include "List_Node.h"
+#include "ace/Copy_Disabled.h"
+
+#if defined (ACE_HAS_GPERF)
+
+/**
+ * Hash table used to check for duplicate keyword entries.
+ *
+ * This implementation uses "double hashing."
+ *
+ * @todo This class should be replaced by something in ACE, e.g.,
+ * ACE_Hash_Map_Manager.  Perhaps we should implement a new
+ * ACE_Hash_Map that uses double hashing, however!
+ */
+class Hash_Table : private ACE_Copy_Disabled
+{
+public:
+  /// Constructor
+  Hash_Table (size_t s);
+
+  /// Destructor
+  ~Hash_Table (void);
+
+  List_Node *find (List_Node *item, int ignore_length);
+
+private:
+  /// Vector of pointers to linked lists of List_Node's.
+  List_Node **table_;
+
+  /// Size of the vector.
+  size_t size_;
+
+  /// Find out how well our double hashing is working!
+  int collisions_;
+};
+
+#endif /* ACE_HAS_GPERF */
+#endif /* HASH_TABLE_H */