From 378ac3148e7e4c95490e46abd799c1d71ff7f262 Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Mon, 28 Nov 1994 17:59:41 +0000
Subject: [PATCH] Have just one conditional to include unistd.h. Test
 NEED_UNISTD_H, not AIX and IRIX4. (UNISTD_H_INCLUDED): Don't define or test
 this.

---
 src/systty.h | 13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/src/systty.h b/src/systty.h
index b74215b84c..7bc1da206b 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -138,22 +138,13 @@ static struct sensemode {
 #if defined (HPUX) && defined (HAVE_PTYS)
 #include <sys/ptyio.h>
 #endif
-  
+
 #ifdef AIX
 #include <sys/pty.h>
-#include <unistd.h>
-#define UNISTD_H_INCLUDED
 #endif /* AIX */
 
-#ifdef IRIX4
-/* Get _getpty prototype */
-#include <unistd.h>
-#define UNISTD_H_INCLUDED
-#endif
-
-#if defined (POSIX) && !defined (UNISTD_H_INCLUDED) && defined (HAVE_UNISTD_H)
+#if (defined (POSIX) || defined (NEED_UNISTD_H)) && defined (HAVE_UNISTD_H)
 #include <unistd.h>
-#define UNISTD_H_INCLUDED
 #endif
 
 #ifdef SYSV_PTYS
-- 
2.20.1