Pip install Matplotlib error with virtualenv

Question

I am trying to install matplotlib in a new virtualenv.

When I do:

pip install matplotlib

or

pip install http://so         


        

Answer 1

Building Matplotlib requires libpng (and freetype, as well) which isn't a python library, so pip doesn't handle installing it (or freetype).

You'll need to install something along the lines of libpng-devel and freetype-devel (or whatever the equivalent is for your OS).

See the building requirements/instructions for matplotlib.