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The C and C++ Include Header Files

/usr/include/x86_64-linux-gnu/sys/socketvar.h


$ cat -n /usr/include/x86_64-linux-gnu/sys/socketvar.h

     1	/* This header is used on many systems but for GNU we have everything
     2	   already defined in the standard header.  */
     3	#include <sys/socket.h>