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/usr/include/x86_64-linux-gnu/asm/unistd.h is in linux-libc-dev 3.16.51-3.

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#ifndef _ASM_X86_UNISTD_H
#define _ASM_X86_UNISTD_H

/* x32 syscall flag bit */
#define __X32_SYSCALL_BIT	0x40000000

# ifdef __i386__
#  include <asm/unistd_32.h>
# elif defined(__ILP32__)
#  include <asm/unistd_x32.h>
# else
#  include <asm/unistd_64.h>
# endif

#endif /* _ASM_X86_UNISTD_H */