--- src/u_deep.c.orig	Thu Apr 20 00:09:49 2017
+++ src/u_deep.c	Thu Apr 20 00:10:32 2017
@@ -20,6 +20,7 @@
 INLINE USHORT DecodeChar(void);
 INLINE USHORT DecodePosition(void);
 INLINE void update(USHORT c);
+extern void update(USHORT c);
 static void reconst(void);
 
 
