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My two suggestions aren't exclusive: If you have the native
inet_pton, you can *always* support IPv6 addresses with
that, regardless of whether --enable-ipv6 was passed to
configure or not.

If that is done, it will be a legitime test failure for
inet_pton not to support IPv6 - after all, the primary
reason to define this function was to support IPv6, so if
the native function fails to do so, there is clearly a bug
in the system.