我尝试了网络上提供的每个链接，但我仍然遇到以下错误：
Edit setup.cfg to change the build options
BUILDING MATPLOTLIB
matplotlib: yes [1.4.x]
python: yes [2.7.5 (default, Jul 28 2013, 07:27:04) [GCC
4.2.1 Compatible Apple LLVM 4.2 (clang-425.0.28)]]
platform: yes [darwin]
REQUIRED DEPENDENCIES AND EXTENSIONS
numpy: yes [version 1.7.1]
dateutil: yes [dateutil was not found. It is required for date
axis support. pip/easy_install may attempt to
install it after matplotlib.]
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: no [pkg-config information for 'freetype2' could
not be found.]
png: yes [pkg-config information for 'libpng' could not
be found. Using unknown version.]
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 [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 [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: no
ghostscript: no
latex: no
pdftops: no
============================================================================
* The following required packages can not be built:
* freetype
以下是我尝试过的事情：
我在我原生的python环境中成功安装了numpy和scipy。由于我无法安装matplotlib，我决定切换到virtualenv。
以下是链接：
每个选项都以上述问题结束。任何帮助都会很棒。