--- src.orig/readline/configure.in	Sun Jul  9 19:19:56 2000
+++ src.new/readline/configure.in	Mon Feb 26 17:58:04 2001
@@ -129,6 +129,7 @@
 
 case "$host_cpu" in
 *cray*)	LOCAL_CFLAGS=-DCRAY ;;
+*s390*) LOCAL_CFLAGS=-fsigned-char ;;
 esac
 
 case "$host_os" in