pip - install matplotlib in virtualenv

Question

I want to install matplotlib to virtualenv using pip. (pip 7.1.0, python 3.4)

$ virtualenv venv
$ source venv/bin/activate
$ pip install matplotlib

...
REQUIRED DEPENDENCIES AND EXTENSIONS
                 numpy: yes [version 1.9.2]
                   six: yes [using six version 1.9.0]
              dateutil: yes [using dateutil version 2.4.2]
                  pytz: yes [using pytz version 2015.4]
               tornado: yes [using tornado version 4.2.1]
             pyparsing: yes [using pyparsing version 2.0.3]
                 pycxx: yes [Official versions of PyCXX are not compatible
                        with matplotlib on Python 3.x, since they lack
                        support for the buffer object.  Using local copy]
                libagg: yes [pkg-config information for 'libagg' could not
                        be found. Using local copy.]

I managed to install most of the dependencies, but pycxx and libaag fails with similar error:

Collecting pycxx
  Could not find a version that satisfies the requirement pycxx (from versions: )
No matching distribution found for pycxx

My question is: What did I do wrong? Is there some workaround?

I could (maybe) install matplotlib using distro package manager and then import it somehow to virtualenv - that's where I would need a help.

Answer 1

Have you got numpy and scipy installed already in the venv ? I had some installation issues for numpy, scipy and matplotlib and upgrading pip and setuptools within the enviroment fixed everything:

$ pip install -U pip
$ pip install -U setuptools

If you install matplotlib using a package manageer you can just do the following when setting up your venv:

$ virtualenv --system-site-packages myvenv

And that should get matplotlib in to myvenv