無法在OS X上的virtualenv中安裝matplotlib（10.12.6）

Question

我無法在OS X（10.12.6）上的虛擬環境中使用pip安裝matplotlib。我正在使用內置的系統版本的Python（/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7），它是Python 2的唯一已安裝版本。

我使用virtualenv（版本15.1.0）創建虛擬環境。 matplotlib安裝控制檯輸出說它不能構建freetype包，但我已經使用brew（它安裝在/usr/local/Cellar/freetype中）安裝了它。下面是安裝控制檯輸出：

(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

OK，所以我設法通過安裝和使用brew鏈接pkg-config包，然後在虛擬環境中運行pip install matplotlib來解決這個問題我自己。