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/usr/include/x86_64-linux-gnu/asm/unistd.h is in linux-libc-dev 3.2.0-23.36.

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The actual contents of the file can be viewed below.

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# ifdef __i386__
#  include <asm/unistd_32.h>
# else
#  include <asm/unistd_64.h>
# endif