无法在OS X（10.12.6）的virtualenv中安装matplotlib

Question

I'm unable to install matplotlib using pip in a virtual environment on OS X (10.12.6). I am using the built-in system version of Python ( /System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7 ) which is the only installed version of Python 2.

I used virtualenv (version 15.1.0) to create the virtual environment. The matplotlib installation console output says that it could not build the freetype package, but I've installed this already using brew (it installed it in /usr/local/Cellar/freetype ). Here's the installation console output:

(venv) $ pip install matplotlib
You are using pip version 7.0.3, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
Collecting matplotlib
  Using cached matplotlib-2.0.2.tar.gz
    Complete output from command python setup.py egg_info:
    IMPORTANT WARNING:
        pkg-config is not installed.
        matplotlib may not be able to find some of its dependencies
    ============================================================================
    Edit setup.cfg to change the build options

    BUILDING MATPLOTLIB
                matplotlib: yes [2.0.2]
                    python: yes [2.7.10 (default, Feb  7 2017, 00:08:15)  [GCC
                            4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)]]
                  platform: yes [darwin]

    REQUIRED DEPENDENCIES AND EXTENSIONS
                     numpy: yes [not found. pip may install it below.]
                       six: yes [using six version 1.10.0]
                  dateutil: yes [using dateutil version 2.6.1]
               functools32: yes [functools32 was not found. It is required
                            forPython versions prior to 3.2]
              subprocess32: yes [subprocess32 was not found. It used  for Python
                            versions prior to 3.2 to improves functionality on
                            Linux and OSX]
                      pytz: yes [using pytz version 2017.2]
                    cycler: yes [cycler was not found. pip will 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.]
                    libagg: yes [pkg-config information for 'libagg' could not
                            be found. Using local copy.]
                  freetype: no  [The C/C++ header for freetype2 (ft2build.h)
                            could not be found.  You may need to install the
                            development package.]
                       png: yes [version 1.6.31]
                     qhull: yes [pkg-config information for 'qhull' could not be
                            found. Using local copy.]

    OPTIONAL SUBPACKAGES
               sample_data: yes [installing]
                  toolkits: yes [installing]
                     tests: no  [skipping due to configuration]
            toolkits_tests: no  [skipping due to configuration]

    OPTIONAL BACKEND EXTENSIONS
                    macosx: yes [installing, darwin]
                    qt5agg: no  [PyQt5 not found]
                    qt4agg: no  [PySide not found; PyQt4 not found]
                   gtk3agg: no  [Requires pygobject to be installed.]
                 gtk3cairo: no  [Requires cairocffi or pycairo to be installed.]
                    gtkagg: no  [Requires pygtk]
                     tkagg: yes [installing; run-time loading from Python Tcl /
                            Tk]
                     wxagg: no  [requires wxPython]
                       gtk: no  [Requires pygtk]
                       agg: yes [installing]
                     cairo: no  [cairocffi or pycairo not found]
                 windowing: no  [Microsoft Windows only]

    OPTIONAL LATEX DEPENDENCIES
                    dvipng: no
               ghostscript: no
                     latex: no
                   pdftops: no

    OPTIONAL PACKAGE DATA
                      dlls: no  [skipping due to configuration]

    ============================================================================
                            * The following required packages can not be built:
                            * freetype

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/vx/3ts13s190k50b2gzt_6zyp0m0000gn/T/pip-build-HCJwzO/matplotlib

Answer 1

好的，因此我设法自己解决了此问题，方法是使用brew安装并链接pkg-config软件包，然后在虚拟环境中运行pip install matplotlib 。