/usr/include/x86_64-linux-gnu/bits/a.out.h is in libc6-dev 2.15-0ubuntu10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | #ifndef __A_OUT_GNU_H__
# error "Never use <bits/a.out.h> directly; include <a.out.h> instead."
#endif
#include <bits/wordsize.h>
#if __WORDSIZE == 64
/* Signal to users of this header that this architecture really doesn't
support a.out binary format. */
#define __NO_A_OUT_SUPPORT 1
#endif
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