diff --git a/zebra/debug.h b/zebra/debug.h
new file mode 100644
index 0000000..6eaa957
--- /dev/null
+++ b/zebra/debug.h
@@ -0,0 +1,52 @@
+/*
+ * Zebra debug related function
+ * 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.  
+ */
+
+#ifndef _ZEBRA_DEBUG_H
+#define _ZEBRA_DEBUG_H
+
+/* Debug flags. */
+#define ZEBRA_DEBUG_EVENT   0x01
+
+#define ZEBRA_DEBUG_PACKET  0x01
+#define ZEBRA_DEBUG_SEND    0x20
+#define ZEBRA_DEBUG_RECV    0x40
+#define ZEBRA_DEBUG_DETAIL  0x80
+
+#define ZEBRA_DEBUG_KERNEL  0x01
+
+/* Debug related macro. */
+#define IS_ZEBRA_DEBUG_EVENT  (zebra_debug_event & ZEBRA_DEBUG_EVENT)
+
+#define IS_ZEBRA_DEBUG_PACKET (zebra_debug_packet & ZEBRA_DEBUG_PACKET)
+#define IS_ZEBRA_DEBUG_SEND   (zebra_debug_packet & ZEBRA_DEBUG_SEND)
+#define IS_ZEBRA_DEBUG_RECV   (zebra_debug_packet & ZEBRA_DEBUG_RECV)
+#define IS_ZEBRA_DEBUG_DETAIL (zebra_debug_packet & ZEBRA_DEBUG_DETAIL)
+
+#define IS_ZEBRA_DEBUG_KERNEL (zebra_debug_kernel & ZEBRA_DEBUG_KERNEL)
+
+extern unsigned long zebra_debug_event;
+extern unsigned long zebra_debug_packet;
+extern unsigned long zebra_debug_kernel;
+
+void zebra_debug_init ();
+
+#endif /* _ZEBRA_DEBUG_H */