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Thanks for confirming. Somehow I never noticed the import config line - guess that's a pattern I'm not really used to seeing. Still, I prefer having the env variables there as I invoke the scripts through some batch files (very specific to my machine, unfortunately, but the 3.5 ones will be more generic).
And since you mention it, apparently I'm not using build_tkinter.py any more either. I was at one point, hence the fix. I'll leave it in there - we can probably remove the file completely but no harm in leaving it.