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Instead of the project macro, the sockaddr_storage and sockaddr.sa_len can be checked with the AC_CHECK_TYPES and AC_CHECK_MEMBERS by including the sys/socket.h. Some systems (~1988) didn't include the sys/types.h in the socket.h (obsolete on current systems).
These macros by default define the HAVE_STRUCT_SOCKADDR_STORAGE and HAVE_STRUCT_SOCKADDR_SA_LEN.