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diff --git a/gcc/et-forest.h b/gcc/et-forest.h
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+++ b/gcc/et-forest.h
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+/* Et-forest data structure implementation.
+   Copyright (C) 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc.
+
+   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 3 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; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This package implements ET forest data structure. Each tree in
+   the structure maintains a tree structure and offers logarithmic time
+   for tree operations (insertion and removal of nodes and edges) and
+   poly-logarithmic time for nearest common ancestor.
+
+   ET tree stores its structure as a sequence of symbols obtained
+   by dfs(root)
+
+   dfs (node)
+   {
+     s = node;
+     for each child c of node do
+       s = concat (s, c, node);
+     return s;
+   }
+
+   For example for tree
+
+            1
+          / | \
+         2  3  4
+       / |
+      4  5
+
+   the sequence is 1 2 4 2 5 3 1 3 1 4 1.
+
+   The sequence is stored in a slightly modified splay tree.
+   In order to support various types of node values, a hashtable
+   is used to convert node values to the internal representation.  */
+
+#ifndef _ET_TREE_H
+#define _ET_TREE_H
+
+#include <ansidecl.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* The node representing the node in an et tree.  */
+struct et_node
+{
+  void *data;			/* The data represented by the node.  */
+
+  int dfs_num_in, dfs_num_out;	/* Number of the node in the dfs ordering.  */
+
+  struct et_node *father;	/* Father of the node.  */
+  struct et_node *son;		/* The first of the sons of the node.  */
+  struct et_node *left;
+  struct et_node *right;	/* The brothers of the node.  */
+
+  struct et_occ *rightmost_occ;	/* The rightmost occurrence.  */
+  struct et_occ *parent_occ;	/* The occurrence of the parent node.  */
+};
+
+struct et_node *et_new_tree (void *data);
+void et_free_tree (struct et_node *);
+void et_free_tree_force (struct et_node *);
+void et_free_pools (void);
+void et_set_father (struct et_node *, struct et_node *);
+void et_split (struct et_node *);
+struct et_node *et_nca (struct et_node *, struct et_node *);
+bool et_below (struct et_node *, struct et_node *);
+struct et_node *et_root (struct et_node *);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* _ET_TREE_H */