From ab4af2c1a61550cd300ff8dcd57fce6099f3338e Mon Sep 17 00:00:00 2001
From: Yanfeng Liu <yfliu2008@qq.com>
Date: Tue, 29 Jul 2025 18:10:17 +0800
Subject: [PATCH] py/mphal: Add stddef.h header for size_t.

This includes "stddef.h" for `size_t` to resolve NuttX integration build
issues.

Signed-off-by: Yanfeng Liu <yfliu2008@qq.com>
---
 py/mphal.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/py/mphal.h b/py/mphal.h
index a4f222d0b1e11..d52e10be44c3c 100644
--- a/py/mphal.h
+++ b/py/mphal.h
@@ -27,6 +27,7 @@
 #define MICROPY_INCLUDED_PY_MPHAL_H
 
 #include <stdint.h>
+#include <stddef.h>
 #include "py/mpconfig.h"
 
 #ifdef MICROPY_MPHALPORT_H