diff --git a/ospfd/ospf_spf.h b/ospfd/ospf_spf.h
new file mode 100644
index 0000000..7fe682e
--- /dev/null
+++ b/ospfd/ospf_spf.h
@@ -0,0 +1,50 @@
+/*
+ * OSPF calculation.
+ * Copyright (C) 1999 Kunihiro Ishiguro
+ *
+ * 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.
+ */
+
+#define OSPF_VERTEX_ROUTER  1
+#define OSPF_VERTEX_NETWORK 2
+
+#define OSPF_VERTEX_PROCESSED      0x01
+
+
+struct vertex
+{
+  u_char flags;
+  u_char type;
+  struct in_addr id;
+  struct lsa_header *lsa;
+  u_int32_t distance;
+  list child;
+  list nexthop;
+};
+
+struct vertex_nexthop
+{
+  struct ospf_interface *oi;
+  struct in_addr router;
+  struct vertex *parent;
+};
+
+void ospf_spf_calculate_schedule ();
+void ospf_rtrs_free (struct route_table *);
+
+/* void ospf_spf_calculate_timer_add (); */