MacBook Air に matplotlib をインストールしようとしましたが、常に次のエラー メッセージが表示されます。
Processing matplotlib-1.1.1_notests.tar.gz
Running matplotlib-1.1.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-3jFpXK/matplotlib-1.1.1/egg-dist-tmp-jC7QY3
basedirlist is: []
============================================================================
BUILDING MATPLOTLIB
matplotlib: 1.1.1
python: 2.7.2 (default, Jun 20 2012, 16:23:33) [GCC 4.2.1
Compatible Apple Clang 4.0
(tags/Apple/clang-418.0.60)]
platform: darwin
REQUIRED DEPENDENCIES
numpy: 1.6.1
freetype2: found, but unknown version (no pkg-config)
* WARNING: Could not find 'freetype2' headers in any
* of '.', './freetype2'.
OPTIONAL BACKEND DEPENDENCIES
libpng: found, but unknown version (no pkg-config)
* Could not find 'libpng' headers in any of '.'
Tkinter: Tkinter: version not identified, Tk: 8.5, Tcl: 8.5
Gtk+: no
* Building for Gtk+ requires pygtk; you must be able
* to "import gtk" in your build/install environment
Mac OS X native: yes
Qt: no
Qt4: no
PySide: no
Cairo: no
OPTIONAL DATE/TIMEZONE DEPENDENCIES
datetime: present, version unknown
dateutil: 1.5
pytz: matplotlib will provide
adding pytz
OPTIONAL USETEX DEPENDENCIES
dvipng: 1.14
ghostscript: 9.05
latex: 3.1415926
[Edit setup.cfg to suppress the above messages]
pymods ['pylab']
packages ['matplotlib', 'matplotlib.backends', 'matplotlib.backends.qt4_editor', 'matplotlib.projections', 'matplotlib.testing', 'matplotlib.testing.jpl_units', 'matplotlib.tests', 'mpl_toolkits', 'mpl_toolkits.mplot3d', 'mpl_toolkits.axes_grid', 'mpl_toolkits.axes_grid1', 'mpl_toolkits.axisartist', 'matplotlib.sphinxext', 'matplotlib.tri', 'matplotlib.delaunay', 'pytz']
warning: no files found matching 'KNOWN_BUGS'
warning: no files found matching 'INTERACTIVE'
warning: no files found matching 'MANIFEST'
warning: no files found matching '__init__.py'
warning: no files found matching 'examples/data/*'
warning: no files found matching 'lib/mpl_toolkits'
warning: no files found matching 'LICENSE*' under directory 'license'
clang: warning: argument unused during compilation: '-mno-fused-madd'
In file included from src/ft2font.cpp:3:
src/ft2font.h:16:10: fatal error: 'ft2build.h' file not found
**#include <ft2build.h>
^
1 error generated.
error: Setup script exited with error: command 'clang' failed with exit status 1**
homebrew を使用して freetype と libpng をインストールしようとしましたが、うまくいきません。どうすれば ft2build.h を入手できますか?