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diff --git a/include/ternary.h b/include/ternary.h
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+/* ternary.h - Ternary Search Trees
+   Copyright 2001 Free Software Foundation, Inc.
+
+   Contributed by Daniel Berlin (dan@cgsoftware.com)
+
+
+   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, 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 TERNARY_H_
+#define TERNARY_H_
+/* Ternary search trees */
+
+typedef struct ternary_node_def *ternary_tree;
+
+typedef struct ternary_node_def
+{
+  char splitchar;
+  ternary_tree lokid;
+  ternary_tree eqkid;
+  ternary_tree hikid;
+}
+ternary_node;
+
+/* Insert string S into tree P, associating it with DATA. 
+   Return the data in the tree associated with the string if it's
+   already there, and replace is 0.
+   Otherwise, replaces if it it exists, inserts if it doesn't, and
+   returns the data you passed in. */
+void *ternary_insert (ternary_tree *p, char *s, void *data, int replace);
+
+/* Delete the ternary search tree rooted at P. 
+   Does NOT delete the data you associated with the strings. */
+void ternary_cleanup (ternary_tree p);
+
+/* Search the ternary tree for string S, returning the data associated
+   with it if found. */
+void *ternary_search (ternary_tree p, char *s);
+#endif