tcl/tk version confusion with tkinter in Python 2.6, on OS X

[njwilson23 at gmail.com]

I'm having trouble with tkinter on a new installation of Python (2.6),
built with the framework option from source that was downloaded from
python.org. I'm running OS 10.4 on a PowerPC G4.

The problem first arose when I tried to run matplotlib - it couldn't
find tcl/tk because it was searching for 8.5, and I had 8.4. I found
and built tcl/tk 8.5, which led to a new error, reproduced below:

Traceback (most recent call last):
  File "brownian2.py", line 55, in <module>
    main()
  File "brownian2.py", line 41, in main
    root = Tk()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1645, in __init__
    self._loadtk()
  File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
python2.6/lib-tk/Tkinter.py", line 1659, in _loadtk
    % (_tkinter.TK_VERSION, tk_version)
RuntimeError: tk.h version (8.4) doesn't match libtk.a version (8.5)

I'm a bit of a neophyte - can anyone tell me how to go about fixing
this? I've found some information by searching the list and Google,
but no helpful solutions.

Thanks,
Nat