Thanks for reply - I discovered the MacPG installer, which worked, so no urgency on
this but I provide the output from ./configure in case it helps others. It's in
RichTextFormat (.rtf) -- if you require plain text just let me know.

Thanks. I believe the relevant part is:

checking whether the resolver is usable... no
checking whether I can make the resolver usable with BIND_8_COMPAT... no

The latter is indeed a MacOS X specific thing.

Would you be so kind to execute the following commands on your machine, and
report the results back?

grep COMPAT /usr/include/arpa/*
grep PACKETSZ /usr/include/arpa/*

Thanks - attached please find the results of the grep command on the arpa directory...