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I'm concerned that this section in configure.in might
collect old cruft, without a chance of ever getting rid of
it. Therefore, in general, I would like to see each setting
be reconsidered every time a new OS release is made;
allowing for removal of settings for systems that are not
supported any longer.

In the specific case, this is probably fine as-is, since
"Darwin 8.*" will likely be superceded with Darwin 9.0
within a few years, at which point the issue then is
reconsidered.