pypimatplotlib95% confidence\u2191 109

Pip install Matplotlib error with virtualenv

Full error message

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.

Solutionsource: stackoverflow \u2197

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.

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