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/usr/include/linux/unistd.h is in linux-libc-dev 3.2.0-23.36.

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#ifndef _LINUX_UNISTD_H_
#define _LINUX_UNISTD_H_

/*
 * Include machine specific syscall numbers
 */
#include <asm/unistd.h>

#endif /* _LINUX_UNISTD_H_ */