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Mac安装python图像处理库pil

开发平台是Mac,需要用到Python的图像处理库PIL,下面记录了安装过程以及出现的问题。

基本安装过程是这样的,使用命令pip进行安装

$ pip install PIL
Downloading/unpacking PIL
  Could not find any downloads that satisfy the requirement PIL
  Some externally hosted files were ignored (use --allow-external PIL to allow).
Cleaning up...
No distributions at all found for PIL
Storing debug log for failure in /Users/mylxsw/.pip/pip.log

提示需要添加--allow-external参数

$ pip2.7 install PIL --allow-external PIL
Downloading/unpacking PIL
  Could not find any downloads that satisfy the requirement PIL
  Some insecure and unverifiable files were ignored (use --allow-unverified PIL to allow).
Cleaning up...
No distributions at all found for PIL
Storing debug log for failure in /Users/mylxsw/.pip/pip.log

又报错了,提示需要添加--allow-unverified参数

$ pip2.7 install PIL --allow-external PIL --allow-unverified PIL
...
_imagingft.c:73:10: fatal error: 'freetype/fterrors.h' file not found

#include <freetype/fterrors.h>

         ^

1 error generated.
...

提示缺少freetype/fterrors.h头文件,可是系统已经安装了,于是从stackoverflow上找到方案:

$ ln -s /usr/local/include/freetype2 /usr/local/include/freetype

再次安装

$ pip2.7 install PIL --allow-external PIL --allow-unverified PIL
Downloading/unpacking PIL
...
Successfully installed PIL
Cleaning up...

OK!