To builk the matplotlib users guide, you will need to
* add the styles dir to your TEXINPUTS environment variable
* Generate the figures (png and eps) by running the script runall.py
in the code dir. Verify that the figures in the figures dir are
built. Verify also that the *.dat files in data were built
* run latex
> latex users_guide # to generate dvi/ps and
or
> pdflatex users_guide # pdf