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The C and C++ Include Header Files

cat -n /usr/include/x86_64-linux-gnu/gnu/lib-names.h

     1	/* This file is automatically generated.
     2	   It defines macros to allow user program to find the shared
     3	   library files which come as part of GNU libc.  */
     4	#ifndef __GNU_LIB_NAMES_H
     5	#define __GNU_LIB_NAMES_H	1
     6	
     7	#if !defined __x86_64__
     8	# include <gnu/lib-names-32.h>
     9	#endif
    10	#if defined __x86_64__ && defined __LP64__
    11	# include <gnu/lib-names-64.h>
    12	#endif
    13	#if defined __x86_64__ && defined __ILP32__
    14	# include <gnu/lib-names-x32.h>
    15	#endif
    16	
    17	#endif	/* gnu/lib-names.h */