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

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#ifndef __A_OUT_GNU_H__
# error "Never use <bits/a.out.h> directly; include <a.out.h> instead."
#endif

/* Signal to users of this header that this architecture really doesn't
   support a.out binary format.  */
#define __NO_A_OUT_SUPPORT 1