【发布时间】：2017-04-06 20:41:52
【问题描述】：
我在通过 pip 安装 lxml 时收到这些错误：
running build_ext
building 'lxml.etree' extension
creating build/temp.linux-i686-3.5
creating build/temp.linux-i686-3.5/src
creating build/temp.linux-i686-3.5/src/lxml
gcc -pthread -fno-strict-aliasing -Wsign-compare -Wunreachable-code -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -fPIC -I/usr/include/libxml2 -Isrc/lxml/includes -I/usr/local/include/python3.5m -c src/lxml/lxml.etree.c -o build/temp.linux-i686-3.5/src/lxml/lxml.etree.o -w
In file included from src/lxml/lxml.etree.c:321:
src/lxml/includes/etree_defs.h:19:4: error: #error minimum required version of libxml2 is 2.7.0
src/lxml/includes/etree_defs.h:28:4: error: #error minimum required version of libxslt is 1.1.23
src/lxml/lxml.etree.c: In function ‘__pyx_pf_4lxml_5etree_9XMLParser___init__’:
src/lxml/lxml.etree.c:113201: error: ‘XML_PARSE_HUGE’ undeclared (first use in this function)
src/lxml/lxml.etree.c:113201: error: (Each undeclared identifier is reported only once
src/lxml/lxml.etree.c:113201: error: for each function it appears in.)
src/lxml/lxml.etree.c: In function ‘__pyx_pf_4lxml_5etree_10Schematron_6__call__’:
src/lxml/lxml.etree.c:194047: error: ‘XML_SCHEMATRON_OUT_ERROR’ undeclared (first use in this function)
Compile failed: command 'gcc' failed with exit status 1
creating tmp
cc -I/usr/include/libxml2 -I/usr/include/libxml2 -c /tmp/xmlXPathInitomumkupc.c -o tmp/xmlXPathInitomumkupc.o
cc tmp/xmlXPathInitomumkupc.o -L/usr/lib -lxml2 -o a.out
error: command 'gcc' failed with exit status 1
----------------------------------------
Command "/usr/local/bin/python3.5 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-2c9_3zz2/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-du99fdnt-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-2c9_3zz2/lxml/
假设某些软件包不符合要求，我尝试通过 yum 更新它们：
软件包 libxml2-2.6.26-2.1.25.el5_11.i386 已安装且最新版本
软件包 libxslt-1.1.17-4.el5_8.3.i386 已安装且最新版本
我在 CentOS 上使用 Python 3.5.1。没有直接的安装方法吗？
也许值得寻找另一个 yum 回购？
如果我尝试通过 https://serverfault.com/questions/266927/install-libxml2-2-7-x-on-centos-5-x#305682 这两个包的手动安装（libxslt 1.1.23 和 libxml 2-2.7.2）以使它们保持最新状态，则在尝试在 Python 中使用 lxml 时出现此错误3.5：
>>> from lxml import html
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python3.5/site-packages/lxml/html/__init__.py", line 54, in <module>
from .. import etree
ImportError: /usr/local/lib/python3.5/site-packages/lxml/etree.cpython-35m-i386-linux-gnu.so: undefined symbol: xmlMemDisplayLast
【问题讨论】：
-
libxslt怎么样？那是您应该安装的另一个库。 -
@schwobaseggl 是的，已经安装好了
Package libxslt-1.1.17-4.el5_8.3.i386 already installed and latest version -
鉴于消息
error minimum required version of libxml2 is 2.7.0和error minimum required version of libxslt is 1.1.23，您是说您的问题是您不知道如何在CENTOS 上安装满足这些要求的软件包？这有帮助吗：serverfault.com/questions/266927/…? -
@snakecharmerb 我尝试手动安装却遇到更多错误，我将其添加到问题中
-
所以看起来 lxml 现在可以构建，但不知何故没有正确编译。您能告诉我们：您安装了哪些版本的 libxml2 和 libxslt？您安装了哪些版本的 libxml2-devel 和 libxslt-devel？你安装的是什么版本的lxml？