I don't know why a 10.5.2 host would consider these "unknown".
A 10.4 host would make more sense, as these are not defined there.
Aha! The problem turned out to be obsolete developer tools — I checked
the version numbers of gdb on both machines, and the Mini still had
6.1 (from Tiger). I think what happened was that, last year when I
upgraded the Mini to Leopard, I skipped Xcode due to lack of disk
space, since I wasn't using that machine for anything work related. So
the developer tools, including command-line stuff, all remained at
10.4. I'm upgrading now. Thanks for the hint!
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