Blame bits/endian.h

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/* This file should define __BYTE_ORDER as appropriate for the machine
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   in question.  See string/endian.h for how to define it.
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   If only the stub bits/endian.h applies to a particular configuration,
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   bytesex.h is generated by running a program on the host machine.
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   So if cross-compiling to a machine with a different byte order,
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   the bits/endian.h file for that machine must exist.  */
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#ifndef _ENDIAN_H
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# error "Never use <bits/endian.h> directly; include <endian.h> instead."
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#endif
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#error Machine byte order unknown.