$OpenBSD: patch-mspack_mspack_h,v 1.1 2010/07/31 00:30:27 kevlo Exp $
--- mspack/mspack.h.orig	Fri Jul 30 16:35:48 2010
+++ mspack/mspack.h	Fri Jul 30 16:36:00 2010
@@ -360,7 +360,7 @@ struct mspack_system {
    * @see open()
    */
   void (*message)(struct mspack_file *file,
-		  char *format,
+		  const char *format,
 		  ...);
 
   /**
