--- a/configure
+++ b/configure
@@ -5926,7 +5926,7 @@ case $bcle-$bcrl-$LEX in
    ?-?-flex)
 	LEX="flex -I -8" ;;
    ?-y-*)
-	as_fn_error $? "readline works only with flex." "$LINENO" 5 ;;
+	: ;; # as_fn_error $? "readline works only with flex." "$LINENO" 5 ;;
 esac
 
 case $LEX-`uname -s` in