Thanks Joel, but I could swear I've tried that after seeing the same
thing in the README and thinking I had found the solution. :-)

I'd like to be able to say absolutely that doesn't solve it, but I
don't have the affected machine in front of me right now. Still,
running configure.bat straight from the win32 folder works fine on the
machine I'm on right now, so I'm fairly certain that's not what's
wrong.

Thanks,
  -Sam