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://sourceforge.net/projects/matplotlib/files/matplotlib/matplotlib-1.1.0/matplotlib-1.1.0.tar.gz

I get this error:

building 'matplotlib._png' extension

gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -fPIC -  DPY_ARRAY_UNIQUE_SYMBOL=MPL_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/usr/local/include -I/usr/include -I. -I/home/sam/django-projects/datazone/local/lib/python2.7/site-packages/numpy/core/include -I. -I/usr/include/python2.7 -c src/_png.cpp -o build/temp.linux-x86_64-2.7/src/_png.o

src/_png.cpp:10:20: fatal error: png.h: No such file or directory

compilation terminated.

error: command 'gcc' failed with exit status 1

Anyone have an idea what is going on?

Any help much appreciated.

Answer 1

On OSX I was able to get matplotlib to install via:

pip install matplotlib==1.4.0

only after I ran:

brew install freetype

Answer 2

Another option is to install anaconda, which comes with packages such as: Matplotlib, numpy and pandas.

https://anaconda.org

Answer 3

If on MacOSx try

xcode-select --install

This complies subprocess 32, the reason for the failure.

Answer 4

As a supplementary, on Amazon EC2, what I need to do is:

sudo yum install freetype-devel
sudo yum install libpng-devel
sudo pip install matplotlib

Answer 5

Under Windows this worked for me:

python -m pip install -U pip setuptools
python -m pip install matplotlib

(from https://matplotlib.org/users/installing.html)