matplotlib Mac binary that works with python and older MacOS X?

I'm trying to find a matplotlib 0.99.3 binary installer that works with
the standard Python (preferably 2.6) and hence works with Mac
OS X 10.4 or greater. (I distribute an application that needs to run on
a wide range of versions of Mac OS X).

The official binary I found refuses to install on my machine claiming it
wants system python 2.6 (I happen to be running 10.5 so that's no use to
me, and some users of my application are running 10.4).

I also tried the egg, but of course it fails -- presumably it's based on
the same build.

If a binary isn't available I"ll make my own, but I figured I'd check

-- Russell