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/usr/include/x86_64-linux-musl/stddef.h is in musl-dev 0.9.15-1.

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#ifndef _STDDEF_H
#define _STDDEF_H

#ifdef __cplusplus
#define NULL 0L
#else
#define NULL ((void*)0)
#endif

#define __NEED_ptrdiff_t
#define __NEED_size_t
#define __NEED_wchar_t

#include <bits/alltypes.h>

#if __GNUC__ > 3
#define offsetof(type, member) __builtin_offsetof(type, member)
#else
#define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
#endif

#endif