From e0b5b76c4ed26258e148a84757d1b80ce168da70 Mon Sep 17 00:00:00 2001
From: "Richard M. Stallman" <rms@gnu.org>
Date: Wed, 9 Apr 1997 05:57:50 +0000
Subject: [PATCH] (GETPGRP_NO_ARG): If Glibc 2.1 or later, don't define this if
 _BSD_SOURCE is defined.

---
 src/systty.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/systty.h b/src/systty.h
index fda88d4c9da..4b8c2262ea0 100644
--- a/src/systty.h
+++ b/src/systty.h
@@ -296,7 +296,15 @@ static struct sensemode {
 
 #ifdef __GNU_LIBRARY__
 /* GNU libc by default defines getpgrp with no args on all systems.  */
+#if __GLIBC__  >= 2
+/* glibc-2.1 adds the BSD compatibility getpgrp function
+   if you use __BSD_SOURCE, which Emacs does on GNU/Linux systems.  */
+#if __GLIBC_MINOR__ < 1 || ! defined (_BSD_SOURCE)
 #define GETPGRP_NO_ARG
+#endif
+#else /* __GLIBC__ < 2 */
+#define GETPGRP_NO_ARG
+#endif /* __GLIBC__ < 2 */
 #else /* not __GNU_LIBRARY__ */
 #if defined (USG) && !defined (GETPGRP_NEEDS_ARG)
 #  if !defined (GETPGRP_NO_ARG)
-- 
2.39.2