$NetBSD$

 - const correctness demanded by recent gcc

--- io.h~	1997-03-19 13:41:40.000000000 +0000
+++ io.h
@@ -13,9 +13,9 @@
 #define io_h
 
 void   ack   ();
-void   s_ack (char msg []);
+void   s_ack (const char msg []);
 bool   ok    ();
-double d_get (char msg []);
-int    i_get (char msg []);
+double d_get (const char msg []);
+int    i_get (const char msg []);
 
 #endif
