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/usr/lib/klibc/include/stdarg.h is in libklibc-dev 2.0.4-9.

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/*
 * stdarg.h
 *
 * This is just a wrapper for the gcc one, but defines va_copy()
 * even if gcc doesn't.
 */

/* Note: the _STDARG_H macro belongs to the gcc header... */
#include_next <stdarg.h>

/* Older gcc considers this an extension, so it's double underbar only */
#ifndef va_copy
#define va_copy(d,s) __va_copy(d,s)
#endif