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

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#ifndef _STDARG_H
#define _STDARG_H

#ifdef __cplusplus
extern "C" {
#endif

#define __NEED_va_list

#include <bits/alltypes.h>

#if __GNUC__ >= 3
#define va_start(v,l)   __builtin_va_start(v,l)
#define va_end(v)       __builtin_va_end(v)
#define va_arg(v,l)     __builtin_va_arg(v,l)
#define va_copy(d,s)    __builtin_va_copy(d,s)
#else
#include <bits/stdarg.h>
#endif

#ifdef __cplusplus
}
#endif

#endif