This file is indexed.

/usr/s390x-linux-gnu/include/bits/endian.h is in libc6-dev-s390x-cross 2.23-0ubuntu3cross1.

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/* s390 is big-endian */

#ifndef _ENDIAN_H
# error "Never use <bits/endian.h> directly; include <endian.h> instead."
#endif

#define __BYTE_ORDER __BIG_ENDIAN