--- SeeTeX/libtex/error.c.orig	Wed Jul 11 07:59:49 1990
+++ SeeTeX/libtex/error.c	Sat Apr 25 21:45:14 1998
@@ -38,7 +38,7 @@
 
 extern char *ProgName;		/* program name from argv[0] */
 extern int errno;		/* Unix system-call error */
-extern char *sys_errlist[];	/* table of error number => string */
+extern const char *const sys_errlist[];	/* table of error number => string */
 extern int sys_nerr;		/* size of table */
 
 static FILE *trap_file;		/* error diversion file, if any */