未定义的符号：xmlMemDisplayLast误差LXML

问题描述：

我收到通过PIP安装LXML这些错误：未定义的符号：xmlMemDisplayLast误差LXML

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/

假设有些包不符合要求，我试图通过yum更新它们：

已安装的软件包libxml2-2.6.26-2.1.25.el5_11.i386和最新版本

包装的libxslt-1.1.17-4.el5_8.3.i386已经安装了最新版本

我在CentOS上用Python 3.5.1。有没有简单的方法来安装它？

也许值得寻找另一个百胜回购？

如果我尝试通过这两个软件包的https://serverfault.com/questions/266927/install-libxml2-2-7-x-on-centos-5-x#305682手动安装（libxslt 1.1.23和libxml 2-2.7.2）以使它们保持最新，那么在尝试在Python 3.5中使用lxml时会出现此错误：

>>> 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

怎么样'libxslt'？这是你应该安装的其他库。 – schwobaseggl

@schwobaseggl是的，已经安装了'Package libxslt-1.1.17-4.el5_8.3.i386已安装并且最新版本' – Zeno

鉴于消息“错误最低要求版本的libxml2是2.7.0'且错误最低要求版本的libxslt是1.1.23'，你是说你的问题是你不知道如何获得满足安装在CENTOS上的这些要求的软件包？这有助于：http://serverfault.com/questions/266927/install-libxml2-2-7-x-on-centos-5-x#305682？ – snakecharmerb

答

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

的libxml2-devel的&的libxslt-devel的的版本不满足要求。

尝试yum install libxml2-devel libxslt-devel

*假设有些软件包不符合要求，我尝试通过yum *更新它们，然后是太旧的软件包版本。他们需要帮助寻找新的软件包。 –

这给了我“已安装和最新版本” – Zeno

未定义的符号：xmlMemDisplayLast误差LXML

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