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diff --git a/src/keyword-list.h b/src/keyword-list.h
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+/* This may look like C code, but it is really -*- C++ -*- */
+
+/* Keyword list.
+
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>.
+
+   This file is part of GNU GPERF.
+
+   GNU GPERF 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, or (at your option)
+   any later version.
+
+   GNU GPERF 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; see the file COPYING.
+   If not, write to the Free Software Foundation, Inc.,
+   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+#ifndef keyword_list_h
+#define keyword_list_h 1
+
+#include "keyword.h"
+
+/* List node of a linear list of Keyword.  */
+class Keyword_List
+{
+public:
+  /* Constructor.  */
+                        Keyword_List (Keyword *car);
+
+  /* Access to first element of list.  */
+  Keyword *             first () const;
+  /* Access to next element of list.  */
+  Keyword_List *&       rest ();
+
+protected:
+  Keyword_List *        _cdr;
+  Keyword * const       _car;
+};
+
+/* List node of a linear list of KeywordExt.  */
+class KeywordExt_List : public Keyword_List
+{
+public:
+  /* Constructor.  */
+                        KeywordExt_List (KeywordExt *car);
+
+  /* Access to first element of list.  */
+  KeywordExt *          first () const;
+  /* Access to next element of list.  */
+  KeywordExt_List *&    rest ();
+};
+
+/* Copies a linear list, sharing the list elements.  */
+extern Keyword_List * copy_list (Keyword_List *list);
+extern KeywordExt_List * copy_list (KeywordExt_List *list);
+
+/* Deletes a linear list, keeping the list elements in memory.  */
+extern void delete_list (Keyword_List *list);
+
+/* Sorts a linear list, given a comparison function.
+   Note: This uses a variant of mergesort that is *not* a stable sorting
+   algorithm.  */
+extern Keyword_List * mergesort_list (Keyword_List *list,
+                                      bool (*less) (Keyword *keyword1,
+                                                    Keyword *keyword2));
+extern KeywordExt_List * mergesort_list (KeywordExt_List *list,
+                                         bool (*less) (KeywordExt *keyword1,
+                                                       KeywordExt *keyword2));
+
+#ifdef __OPTIMIZE__
+
+#define INLINE inline
+#include "keyword-list.icc"
+#undef INLINE
+
+#endif
+
+#endif