From b2038569d3d1ff4ac17ad20b45a746095db08830 Mon Sep 17 00:00:00 2001
From: Thorsten Otto <admin@tho-otto.de>
Date: Wed, 20 Mar 2024 10:28:35 +0100
Subject: [PATCH] Avoid redefinition of __USE_POSIX199309/_POSIX_C_SOURCE

On glibc systems, they are already defined in <features.h> which is
pulled in by any system header. Defining such macros in header files is
too late.
---
 common/mssleep.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/common/mssleep.h b/common/mssleep.h
index 9f7c8a66..eb1f8ebc 100644
--- a/common/mssleep.h
+++ b/common/mssleep.h
@@ -11,8 +11,12 @@
 #elif defined(_WIN32)
 #include <synchapi.h>
 #else /* Assuming recent posix*/
-#define __USE_POSIX199309
+#ifndef __USE_POSIX199309
+#define __USE_POSIX199309 1
+#endif
+#ifndef _POSIX_C_SOURCE
 #define _POSIX_C_SOURCE 199309L
+#endif
 #include <time.h>
 #endif