diff --git a/lib/pqueue.h b/lib/pqueue.h
new file mode 100644
index 0000000..95f79b8
--- /dev/null
+++ b/lib/pqueue.h
@@ -0,0 +1,41 @@
+/* Priority queue functions.
+   Copyright (C) 2003 Yasuhiro Ohara
+
+This file is part of GNU Zebra.
+
+GNU Zebra 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 Zebra 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 GNU Zebra; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#ifndef _ZEBRA_PQUEUE_H
+#define _ZEBRA_PQUEUE_H
+
+struct pqueue
+{
+  void **array;
+  int array_size;
+  int size;
+
+  int (*cmp) (void *, void *);
+};
+
+#define PQUEUE_INIT_ARRAYSIZE  32
+
+struct pqueue *pqueue_create ();
+void pqueue_delete (struct pqueue *queue);
+
+void pqueue_enqueue (void *data, struct pqueue *queue);
+void *pqueue_dequeue (struct pqueue *queue);
+
+#endif /* _ZEBRA_PQUEUE_H */