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I think it would be best if detect presence of
inet_aton/inet_pton. Is IPv6 support possible on this
system? Then it would be best if that was detected, as well.

If it is not possible to detect aton/pton/ipv6, what is the
problem with not using them?

I'd like to have a look at the relevant headers (in
particular to understand the duplicate definition of
_SGIAPI), indeed.