In article <26F19958-353A-471E-A1EE-DB33F120703A@...3401...>,
Pathways leading to the error message:
I obtained Matplotlib from the matplotlib home page download link to
a) mpkg/dmg installation 1.0.1-r0 fails with message "can't be installed on
this disk. matplotlib requires System Python 2.6 to install"
The mpkg/dmg installer requires python from python.org, not Apple's
built-in python (despite the incorrect error message). The README that
is displayed by the installer does explain this, but it is easy to miss.
Note that the incorrect error message is a known bug in the software
that creates mpkg installers.
I suggest you use the binary installer because building from source is
rather a lot of work, due to the need to install dependencies.