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 
libxslt? That's the other lib you should have installed.Package libxslt-1.1.17-4.el5_8.3.i386 already installed and latest versionerror minimum required version of libxml2 is 2.7.0anderror minimum required version of libxslt is 1.1.23, are you saying your problem is that you don't know how to get packages that satisfy these requirements installed on CENTOS? Does this help: serverfault.com/questions/266927/…?