diff -r af42eec9d383 -r 91d240fa7fa1 kconfig/conf.c
--- a/kconfig/conf.c	Sun Apr 15 16:45:11 2007 +0000
+++ b/kconfig/conf.c	Sun Jan 31 13:03:24 2010 +0100
@@ -503,7 +503,6 @@
 			break;
 		case 's':
 			input_mode = ask_silent;
-			valid_stdin = isatty(0) && isatty(1) && isatty(2);
 			break;
 		case 'd':
 			input_mode = set_default;