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

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#ifndef	_SYS_SYSCTL_H
#define	_SYS_SYSCTL_H

#ifdef __cplusplus
extern "C" {
#endif

#define __NEED_size_t
#include <bits/alltypes.h>

int sysctl (int *, int, void *, size_t *, void *, size_t);

#ifdef __cplusplus
}
#endif

#endif