Mac OS下安装 lxml报错

今天在Mac下安装lxml总是报错，错误信息如下：

n file included from src/lxml/lxml.etree.c:346:

/tmp/easy_install-UkLnaO/lxml-3.3.5/src/lxml/includes/etree_defs.h:9:10: fatal error: 

      'libxml/xmlversion.h' file not found

解决办法：

sudo C_INCLUDE_PATH=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/libxml2:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include/libxml2/libxml:/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.8.sdk/usr/include easy_install lxml

把整段代码复制下来就可以了。我用的是easy_install安装的，也可以使用pip安装，都可以。