diff --git a/Build.sh b/Build.sh
index ba6240f..5851586 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.562 2012/05/04 22:18:22 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.563 2012/05/04 22:34:49 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #		2011, 2012
@@ -1410,7 +1410,7 @@ else
 		#define EXTERN
 		#define MKSH_INCLUDES_ONLY
 		#include "sh.h"
-		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.562 2012/05/04 22:18:22 tg Exp $");
+		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.563 2012/05/04 22:34:49 tg Exp $");
 		int main(void) { printf("Hello, World!\n"); return (0); }
 EOF
 	case $cm in
@@ -2108,6 +2108,7 @@ MKSH_CONSERVATIVE_FDS		fd 0-9 for scripts, shell only up to 31
 MKSH_DEFAULT_EXECSHELL		"/bin/sh" (do not change)
 MKSH_DEFAULT_TMPDIR		"/tmp" (do not change)
 MKSH_DISABLE_DEPRECATED		disable code paths scheduled for later removal
+MKSH_DISABLE_TTY_WARNING	shut up warning about ctty if OS cant be fixed
 MKSH_DONT_EMIT_IDSTRING		omit RCS IDs from binary
 MKSH_MIDNIGHTBSD01ASH_COMPAT	set -o sh: additional compatibility quirk
 MKSH_NOPROSPECTOFWORK		disable jobs, co-processes, etc. (do not use)
diff --git a/jobs.c b/jobs.c
index 9d29984..4879c87 100644
--- a/jobs.c
+++ b/jobs.c
@@ -22,7 +22,7 @@
 
 #include "sh.h"
 
-__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.87 2012/05/04 22:18:25 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/jobs.c,v 1.88 2012/05/04 22:34:50 tg Exp $");
 
 #if HAVE_KILLPG
 #define mksh_killpg		killpg
@@ -329,9 +329,11 @@ j_change(void)
 				kshpgrp = kshpid;
 			}
 		}
+#ifndef MKSH_DISABLE_TTY_WARNING
 		if (use_tty && !ttypgrp_ok)
 			warningf(false, "%s: %s", "warning",
 			    "won't have full job control");
+#endif
 		if (tty_fd >= 0)
 			mksh_tcget(tty_fd, &tty_state);
 	} else {
diff --git a/main.c b/main.c
index 50ab100..fff7aa3 100644
--- a/main.c
+++ b/main.c
@@ -34,7 +34,7 @@
 #include <locale.h>
 #endif
 
-__RCSID("$MirOS: src/bin/mksh/main.c,v 1.220 2012/05/04 22:18:26 tg Exp $");
+__RCSID("$MirOS: src/bin/mksh/main.c,v 1.221 2012/05/04 22:34:51 tg Exp $");
 
 extern char **environ;
 
@@ -1048,10 +1048,12 @@ tty_init(bool init_ttystate, bool need_tty)
 #endif
 	  if ((tfd = open("/dev/tty", O_RDWR, 0)) < 0) {
 		tty_devtty = false;
+#ifndef MKSH_DISABLE_TTY_WARNING
 		if (need_tty)
 			warningf(false, "%s: %s %s: %s",
 			    "No controlling tty", "open", "/dev/tty",
 			    strerror(errno));
+#endif
 	}
 	if (tfd < 0) {
 		do_close = false;
@@ -1060,8 +1062,10 @@ tty_init(bool init_ttystate, bool need_tty)
 		else if (isatty(2))
 			tfd = 2;
 		else {
+#ifndef MKSH_DISABLE_TTY_WARNING
 			if (need_tty)
 				warningf(false, "can't find tty fd");
+#endif
 			return;
 		}
 	}