Thanks for the reviews. I installed the attached.
From 2dd1a7984c6b3e6056cef7e3f9933e0039c21634 Mon Sep 17 00:00:00 2001
From: Paul Eggert <egg...@cs.ucla.edu>
Date: Thu, 9 Nov 2023 10:50:30 -0800
Subject: [PATCH] stdio: port better to older macOS
* lib/stdio.in.h: Do not define _POSIX_C_SOURCE on older macOS,
as it is not needed and defining it causes other problems.
Problem reported by Sevan Janiyan in:
https://mail.gnu.org/r/bug-gnulib/2023-11/msg00039.html
---
ChangeLog | 8 ++++++++
lib/stdio.in.h | 10 ++++++++--
2 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/ChangeLog b/ChangeLog
index 0c49471d04..b8fd98a2b1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2023-11-09 Paul Eggert <egg...@cs.ucla.edu>
+
+ stdio: port better to older macOS
+ * lib/stdio.in.h: Do not define _POSIX_C_SOURCE on older macOS,
+ as it is not needed and defining it causes other problems.
+ Problem reported by Sevan Janiyan in:
+ https://mail.gnu.org/r/bug-gnulib/2023-11/msg00039.html
+
2023-11-09 Bruno Haible <br...@clisp.org>
rand: Add tests.
diff --git a/lib/stdio.in.h b/lib/stdio.in.h
index 118874d877..22b5ca46b2 100644
--- a/lib/stdio.in.h
+++ b/lib/stdio.in.h
@@ -38,8 +38,14 @@
/* Suppress macOS deprecation warnings for sprintf and vsprintf. */
#if (defined __APPLE__ && defined __MACH__) && !defined _POSIX_C_SOURCE
-# define _POSIX_C_SOURCE 200809L
-# define _GL_DEFINED__POSIX_C_SOURCE
+# ifdef __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
+# include <AvailabilityMacros.h>
+# endif
+# if (defined MAC_OS_X_VERSION_MIN_REQUIRED \
+ && 101300 <= MAC_OS_X_VERSION_MIN_REQUIRED)
+# define _POSIX_C_SOURCE 200809L
+# define _GL_DEFINED__POSIX_C_SOURCE
+# endif
#endif
#define _GL_ALREADY_INCLUDING_STDIO_H
--
2.40.1
