Some nice folks responded to my question on Stack Overflow and spotted the typo (I'm sure you can too, now). It could easily have been me who did this, but it turns out I copied and pasted from the readme file (in the Mac directory), and the typo is right there in the first example. So...configure just blows right by my flag and it looks OK until make
So that's solved. A user named Ned Delly had some helpful comments (and others here). I know this name but Google hasn't been my friend---couldn't find out anything. Update: if I could spell: Ned Deily: DEILY
As he says:
The python.org pythons are currently built only as 32-bit (i386 and ppc) and are compatible with OS X 10.3 through 10.6. To do that, they are built with the 10.4u SDK which is available via the 10.6 Xcode installer (on the 10.6 Installation DVD and elsewhere), however that SDK is not installed by default.