undefined symbol: xmlMemDisplayLast error with lxml

Question

I receive these errors on installing lxml via pip:

    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/

Assuming some packages aren't meeting the requirement, I tried updating them via yum:

Package libxml2-2.6.26-2.1.25.el5_11.i386 already installed and latest version

Package libxslt-1.1.17-4.el5_8.3.i386 already installed and latest version

I am on CentOS with Python 3.5.1. Is there no straight forward way to have this installed?

Perhaps it's worth seeking out another yum repo?

If I try a manual install (libxslt 1.1.23 and libxml 2-2.7.2) via https://serverfault.com/questions/266927/install-libxml2-2-7-x-on-centos-5-x#305682 of these two packages to get them up-to-date, I get this error when trying to use lxml in Python 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

Answer 1

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

The version of libxml2-devel & libxslt-devel are not satisfied requirements.

try yum install libxml2-devel libxslt-devel