运行` `pip install`的Ubuntu出现错误‘无法构建以下必需的软件包：* freetype’

Question

在安装matplotlib的阶段执行pip install -r requirements.txt时，我得到了以下错误

REQUIRED DEPENDENCIES AND EXTENSIONS
                 numpy: yes [not found. pip may install it below.]
              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.]

..。

The following required packages can not be built:

                    * freetype

pip install -r requirements.txt不也应该安装freetype吗？如何在Ubuntu12.04中安装freetype才能与matplotlib兼容

Answer 1

我必须安装libxft-dev才能在ubuntu服务器14.04上启用matplotlib。

sudo apt-get install libfreetype6-dev libxft-dev

然后我就可以用

sudo easy_install matplotlib

Answer 2

一种变通方法是使用我发现的in this github issue来做sudo apt-get install pkg-config。

Answer 3

对于我在Ubuntu上升级matplotlib来说，现有的答案都不起作用。这就是最终对我有效的方法：

$ sudo apt-get install build-dep python-matplotlib
$ pip install matplotlib --upgrade