CENTOS6.4安装lxml失败

环境如下：

• Centos6.4
  
• Python 2.7.6

pip install lxml
执行上面的命令，有类似下面的提示：

src/lxml/lxml.etree.c:188133: error: ‘xsltDocDefaultLoader’ undeclared (first use in this function)
src/lxml/lxml.etree.c:188142: warning: implicit declaration of function ‘xsltSetLoaderFunc’
src/lxml/lxml.etree.c:188142: error: ‘xsltDocLoaderFunc’ undeclared (first use in this function)
src/lxml/lxml.etree.c:188142: error: expected ‘)’ before ‘__pyx_f_4lxml_5etree__xslt_doc_loader’
src/lxml/lxml.etree.c:188393: warning: implicit declaration of function ‘xsltRegisterAllExtras’
src/lxml/lxml.etree.c:188402: warning: implicit declaration of function ‘exsltRegisterAll’
error: Setup script exited with error: command 'gcc' failed with exit status 1

像这种情况，一般是对应的devel包没有安装，但是即使我安装了libxml2 和libxml2-devel，还是同样的提示
已经确认过gcc, gcc-c++等基础包安装的了

[root@localhost]$ rpm -qa |grep gcc
gcc-4.4.7-4.el6.x86_64
libgcc-4.4.7-4.el6.x86_64
gcc-c++-4.4.7-4.el6.x86_64

查看pypi上lxml的文档 lxml 3.4.1,可以在第一段就看到下面的一句话：

Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API.

这里指出了lxml 会使用到 libxml2/libxsl

yum search libxml 
yum search libxsl
会发现有libxslt-devel和libxml2-devel

执行shell命令：

yum -y install libxslt-devel

上面的命令执行之后，会自动安装和更新如下的软件包:

1. libxml2
   
2. libxml2-devel
   
3. libgpg-error-devel
   
4. libgcrypt-devel
   
5. libxslt
   
6. libxslt-devel

安装上面了6个软件包之后，pip install lxml就能成功安装lxml了