--- data.h.orig	Thu Mar 21 16:47:04 1991
+++ data.h	Tue Sep 28 13:08:54 1999
@@ -21,7 +21,7 @@
  */
 
 extern int sys_nerr, errno;
-extern char *sys_errlist[];
+/* extern char *sys_errlist[]; */
 #define SYSERR sys_errlist[(errno > sys_nerr? 0 : errno)]
 
 GLOBAL Display *disp;
