--- util/texindex.c.orig	Mon Mar  9 08:48:33 1998
+++ util/texindex.c	Mon Mar  9 08:48:45 1998
@@ -1683,7 +1683,8 @@
 }
 
 #if !defined (HAVE_STRERROR)
-extern char *sys_errlist[];
+# error patch-ad really needed (sys_errlist prototype)
+extern __const char *__const sys_errlist[];
 extern int sys_nerr;
 
 char *