--- mksh-40/check.t~	2011-07-07 22:54:57.000000000 +0200
+++ mksh-40/check.t	2011-07-07 22:59:01.105425013 +0200
@@ -5907,6 +5907,7 @@
 description:
 	Ensure ±U on the command line is honoured
 	(this test may pass falsely depending on CPPFLAGS)
+need-ctty: yes
 stdin:
 	export iter=0
 	code='if [[ $- = *U* ]]; then echo $iter on; else echo $iter off; fi'