Use a locally built Tk for Python?

[Mark Summerfield]

Thanks for your thoughtful replies.

I don't use altinstall because using --prefix is sufficient to get a
locally built Python.

Both your suggestions require root (or sudo) and changing the system
itself. Whereas I was hoping to just build a local Python and install
my own Tcl/Tk in its lib and site-packages (which I believe is what
happens on Windows?).

Anyway, maybe that isn't possible. I will try installing my patched
Tcl/Tk system wide on an old machine and if that works I'll do it to
my main machine and rebuild my Pythons to use it.