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/usr/lib/klibc/include/sys/prctl.h is in libklibc-dev 1.5.25-1ubuntu2.

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#ifndef _SYS_PRCTL_H
#define _SYS_PRCTL_H

#include <klibc/extern.h>
#include <linux/prctl.h>

/* glibc has this as a varadic function, so join the club... */
__extern int prctl(int, ...);

#endif /* _SYS_PRCTL_H */