From bd05d5102880eca0ea2a1f1f713dd2e568bc164c Mon Sep 17 00:00:00 2001
From: Mark Nudelman <markn@greenwoodsoftware.com>
Date: Mon, 29 May 2023 10:20:38 -0700
Subject: [PATCH] Move any_data under #if USE_POLL and ensure that tty variable
 is not accessed when it does not exist (in MSDOS build).

---
 os.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/os.c b/os.c
index 0edc859f..b9097c41 100644
--- a/os.c
+++ b/os.c
@@ -48,6 +48,7 @@ static int use_poll = TRUE;
 #endif
 #if USE_POLL
 #include <poll.h>
+static int any_data = FALSE;
 #endif
 
 /*
@@ -72,7 +73,6 @@ public int consecutive_nulls = 0;
 /* Milliseconds to wait for data before displaying "waiting for data" message. */
 static int waiting_for_data_delay = 4000;
 static jmp_buf read_label;
-static int any_data = FALSE;
 
 extern int sigs;
 extern int ignore_eoi;
@@ -292,8 +292,10 @@ public int iread(int fd, unsigned char *buf, unsigned int len)
 #endif
 		return (READ_ERR);
 	}
+#if USE_POLL
 	if (fd != tty && n > 0)
 		any_data = TRUE;
+#endif
 	return (n);
 }