> go see include/netdb.h for definition of NI_WITHSCOPEID.  it is
> wrapped by #ifdef _NETBSD_SOURCE.

Not as far as I can see, not in the version I first started doing IPv6
code with - I still have such a version on hand (and as I remarked in
another message, once I learn an interface I generally don't go
rechecking it constantly - and unless I have trouble with it I don't go
checking the include files anyway).

It's inside #if !defined(_XOPEN_SOURCE), but the netdb.h in question
doesn't mention _NETBSD_SOURCE at all.

Ah well.  So much for portability.  Foolish of me to imagine NetBSD
would bother with backward compatability, I guess.

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