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Date: Wed, 19 Apr 2023 08:46:17 +0200
From: Jens Gustedt <>
Subject: [C23 divers headers 17/17] C23: add the __STDC_VERSION_STDDEF_H__

Currently we don't know of such a compiler, yet, that fully supports
all the features but this will probably be gcc-13 and
 include/stddef.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/stddef.h b/include/stddef.h
index e4d6b2ef..d85b2c55 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -1,5 +1,5 @@
-#ifndef _STDDEF_H
-#define _STDDEF_H
+#define _STDC_VERSION_STDDEF_H__ 201900L
 #if __cplusplus >= 201103L
 #define NULL nullptr

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