title: `Sudo pip install matplotlib` fails to find freetype headers. [OS X Mavericks / 10.9]
body: <p>I already have <code>matplotlib-1.2.1</code> installed as well as <code>numpy-1.8.0</code>. Note - I am using system python with homebrew installed - I have <code>$PYTHONPATH</code> set so Python loads from <code>/Library/Python/x.y/site-packages</code> (where <code>pip</code> installs to).</p>
  
  <p>Here is the code for installing <code>matplotlib</code> (the configurations)</p>
  
  <pre><code>BUILDING MATPLOTLIB
              matplotlib: yes [1.3.1]
                  python: yes [2.7.5 (default, Aug 25 2013, 00:04:04)  [GCC
                          4.2.1 Compatible Apple LLVM 5.0 (clang-500.0.68)]]
                platform: yes [darwin]
  
  REQUIRED DEPENDENCIES AND EXTENSIONS
                   numpy: yes [version 1.8.0]
                dateutil: yes [using dateutil version 1.5]
                 tornado: yes [tornado was not found. It is required for the
                          WebAgg backend. pip/easy_install may attempt to
                          install it after matplotlib.]
               pyparsing: yes [pyparsing was not found. It is required for
                          mathtext support. pip/easy_install may attempt to
                          install it after matplotlib.]
                   pycxx: yes [Couldn't import.  Using local copy.]
                  libagg: yes [pkg-config information for 'libagg' could not
                          be found. Using local copy.]
                freetype: yes [version 17.1.11]
                     png: yes [version 1.5.17]
  
  OPTIONAL SUBPACKAGES
             sample_data: yes [installing]
                toolkits: yes [installing]
                   tests: yes [nose 0.11.1 or later is required to run the
                          matplotlib test suite]
  
  OPTIONAL BACKEND EXTENSIONS
                  macosx: yes [installing, darwin]
                  qt4agg: no  [PyQt4 not found]
                 gtk3agg: no  [Requires pygobject to be installed.]
               gtk3cairo: no  [Requires cairo to be installed.]
                  gtkagg: no  [Requires pygtk]
                   tkagg: yes [installing, version 81008]
                   wxagg: no  [requires wxPython]
                     gtk: no  [Requires pygtk]
                     agg: yes [installing]
                   cairo: no  [cairo not found]
               windowing: no  [Microsoft Windows only]
  
  OPTIONAL LATEX DEPENDENCIES
                  dvipng: yes [version 1.14]
             ghostscript: yes [version 9.02]
                   latex: yes [version 3.1415926]
                 pdftops: no
  </code></pre>
  
  <p>And then later down the line, after copying and building files, it gets to <code>build_ext</code> and fails because of missing header files.</p>
  
  <pre><code>running build_ext
  building 'matplotlib.ft2font' extension
  creating build/temp.macosx-10.9-intel-2.7
  creating build/temp.macosx-10.9-intel-2.7/src
  creating build/temp.macosx-10.9-intel-2.7/CXX
  cc -fno-strict-aliasing -fno-common -dynamic -arch x86_64 -arch i386 -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch x86_64 -arch i386 -pipe -DPY_ARRAY_UNIQUE_SYMBOL=MPL_matplotlib_ft2font_ARRAY_API -DPYCXX_ISO_CPP_LIB=1 -I/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/numpy/core/include -I/usr/local/include -I/usr/include -I/usr/X11/include -I. -I/usr/local/Cellar/freetype/2.5.2/include/freetype2 -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/ft2font.cpp -o build/temp.macosx-10.9-intel-2.7/src/ft2font.o
  
  clang: warning: argument unused during compilation: '-mno-fused-madd'
  In file included from src/ft2font.cpp:3:
  In file included from src/ft2font.h:6:
  In file included from ./CXX/Extensions.hxx:40:
  In file included from ./CXX/Python2/Extensions.hxx:52:
  ./CXX/Python2/Objects.hxx:1133:23: warning: implicit conversion of NULL constant to 'int' [-Wnull-conversion]
              , offset( NULL )
                      ~ ^~~~
                        0
  
  In file included from src/ft2font.cpp:3:
  In file included from src/ft2font.h:16:
  /usr/X11/include/ft2build.h:56:10: fatal error: 'freetype/config/ftheader.h' file not found
  #include &lt;freetype/config/ftheader.h&gt;
           ^
  1 warning and 1 error generated.
  
  error: command 'cc' failed with exit status 1
  ----------------------------------------
  
    Rolling back uninstall of matplotlib
    Replacing /System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/matplotlib-1.1.1-py2.7.egg-info
  Cleaning up...
    Removing temporary dir /private/tmp/pip_build_root...
  Command /usr/bin/python -c "import setuptools;__file__='/private/tmp/pip_build_root/matplotlib/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vHUPhA-record/install-record.txt --single-version-externally-managed failed with error code 1 in /private/tmp/pip_build_root/matplotlib
  Exception information:
  Traceback (most recent call last):
    File "/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg/pip/basecommand.py", line 134, in main
      status = self.run(options, args)
    File "/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg/pip/commands/install.py", line 241, in run
      requirement_set.install(install_options, global_options, root=options.root_path)
    File "/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg/pip/req.py", line 1298, in install
      requirement.install(install_options, global_options, *args, **kwargs)
    File "/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg/pip/req.py", line 625, in install
      cwd=self.source_dir, filter_stdout=self._filter_install, show_stdout=False)
    File "/Library/Python/2.7/site-packages/pip-1.4.1-py2.7.egg/pip/util.py", line 670, in call_subprocess
      % (command_desc, proc.returncode, cwd))
  InstallationError: Command /usr/bin/python -c "import setuptools;__file__='/private/tmp/pip_build_root/matplotlib/setup.py';exec(compile(open(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-vHUPhA-record/install-record.txt --single-version-externally-managed failed with error code 1 in /private/tmp/pip_build_root/matplotlib
  </code></pre>