I tried to install matplotlib on my MacBook Air, but it always gives me this error message:

 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', 'm
matplotlib
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