From 39031e84952db7d1f981c2c748558aacffc0a3e4 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sun, 24 Aug 2025 22:54:28 +0900
Subject: feat: add include guard

---
 include/stddef.h | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'include/stddef.h')

diff --git a/include/stddef.h b/include/stddef.h
index d4977de..702d91a 100644
--- a/include/stddef.h
+++ b/include/stddef.h
@@ -1,3 +1,6 @@
+#ifndef __DUCC_BUILTIN___STDDEF_H__
+#define __DUCC_BUILTIN___STDDEF_H__
+
 #define NULL 0
 
 // TODO: unsigned
@@ -8,3 +11,5 @@ typedef long size_t;
 // - nullptr_t (C23)
 // - offsetof
 // - ptrdiff_t
+
+#endif
-- 
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