matplotlib v1.0.0: mac installation issue

Hello,
I am running a MacOS Snow leopard and I recently istalled the python 2.6 via Enthought.
I wanted to upgrade the matplotlib 1.0 but when I run the .mpkg the installation don't start because
it seems not recognizing the python 2.6 is installed (I do have now 2.6.6).

Any suggestions?

Thanks,
Nino

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Antonino Cucchiara, PhD
Postdoctoral Scholar
Lawrence Berkeley National Lab
UC Berkeley
website: www.astro.psu.edu/~cucchiara/