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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/bits/a.out.h


$ cat -n /usr/include/x86_64-linux-gnu/bits/a.out.h

     1	#ifndef __A_OUT_GNU_H__
     2	# error "Never use <bits/a.out.h> directly; include <a.out.h> instead."
     3	#endif
     4	
     5	#ifdef __x86_64__
     6	
     7	/* Signal to users of this header that this architecture really doesn't
     8	   support a.out binary format.  */
     9	#define __NO_A_OUT_SUPPORT 1
    10	
    11	#endif