--- patch-2.5.4/error.c.program_name	Tue Apr  9 14:38:27 2002
+++ patch-2.5.4/error.c	Tue Apr  9 14:38:43 2002
@@ -80,7 +80,7 @@
 
 /* The calling program should define program_name and set it to the
    name of the executing program.  */
-extern char *program_name;
+extern char const program_name[];
 
 # ifdef HAVE_STRERROR_R
 #  define __strerror_r strerror_r