Building mpl on OSX has proven to be a nightmare because of all thedifferent types of zlib, png and freetype that may be on your system.The recommended and supported way to build is to use a third-partypackage manager to install the required dependencies, and theninstall matplotlib from source using the setup.py script. Two widelyused package managers are homebrew and MacPorts. The followingexample illustrates how to install libpng and freetype usinghomebrew.Example usage::  brew install libpng freetypeIf you are using MacPorts, execute the following instead:Example usage::  port install libpng freetypeTo install matplotlib from source, execute:Example usage::  python setup.py install