$NetBSD$

Add standard includes needed for LP64 build.

--- gentle/cyfront.c~	1998-08-20 09:56:09.000000000 -0400
+++ gentle/cyfront.c	2009-11-29 18:57:45.000000000 -0500
@@ -7,6 +7,7 @@
 
 */
 
+#include <stdio.h>
 
 typedef long * yy;
 #define yyu (-2147483647L)
