为什么我不能为python安装lxml？

我已经下载了lxml的tarball，我正在使用ipython setup.py安装来尝试安装它。不幸的是，它给了我很多错误信息：

src/lxml/lxml.etree.c:200651: error: ‘XML_XPATH_INVALID_OPERAND’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200661: error: ‘XML_XPATH_INVALID_TYPE’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200671: error: ‘XML_XPATH_INVALID_ARITY’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200681: error: ‘XML_XPATH_INVALID_CTXT_SIZE’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200691: error: ‘XML_XPATH_INVALID_CTXT_POSITION’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200921: error: ‘LIBXSLT_VERSION’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200933: error: ‘xsltLibxsltVersion’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200945: error: ‘__pyx_v_4lxml_5etree_XSLT_DOC_DEFAULT_LOADER’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200945: error: ‘xsltDocDefaultLoader’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200954: error: ‘xsltDocLoaderFunc’ undeclared (first use in this function)
src/lxml/lxml.etree.c:200954: error: expected ‘)’ before ‘__pyx_f_4lxml_5etree__xslt_doc_loader’
An exception has occurred, use %tb to see the full traceback.

SystemExit: error: command 'gcc' failed with exit status 1

有人知道这里发生了什么吗？显然cython会干扰安装，但我的系统上没有安装cython。这是在centos 6.4操作系统上，ipython运行2.7。

lxml依赖于libxml2和libxslt。使用yum安装开发标头：

yum install libxml2-devel libxslt-devel python-devel

lxml依赖于libxml2和libxslt。使用yum安装开发标头：

yum install libxml2-devel libxslt-devel python-devel

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你有python头开发安装吗？你有python头开发安装吗？