Why am I receiving this error when trying to install pyquery python module?

Question

I'm using the following command

!pip install pyquery

I'm able to install other modules. Does anyone know why this is happening? Thanks!

---

src/lxml/includes/etree_defs.h:14:10: fatal error: 'libxml/xmlversion.h' file not found
#include "libxml/xmlversion.h"
         ^
1 error generated.
Compile failed: command 'cc' failed with exit status 1
creating var
creating var/folders
creating var/folders/p1
creating var/folders/p1/xg17tts541n1__p_srg1n2j80000gn
creating var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T
cc -I/usr/include/libxml2 -I/usr/include/libxml2 -c /var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/xmlXPathInit9XZ4sL.c -o var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/xmlXPathInit9XZ4sL.o
/var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/xmlXPathInit9XZ4sL.c:1:10: fatal error: 'libxml/xpath.h' file not found
#include "libxml/xpath.h"
         ^
1 error generated.
*********************************************************************************
Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?
Perhaps try: xcode-select --install
*********************************************************************************
error: command 'cc' failed with exit status 1

----------------------------------------

Command "/usr/bin/python -c "import setuptools, tokenize; file ='/private/var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/pip-build-nn9QXj/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)( file ).read().replace('\\r\\n', '\\n'), file , 'exec'))" install --record /var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/pip-X97yGE-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/p1/xg17tts541n1__p_srg1n2j80000gn/T/pip-build-nn9QXj/lxml

Answer 1

Based on this reference http://forums.fedoraforum.org/showthread.php?t=297730 ,

I was tried installing libffi-devel, libxml2-devel, libxslt-devel and it solved the issue. I'm using CentOS 7.

Answer 2

src/lxml/includes/etree_defs.h:14:10: fatal error: 'libxml/xmlversion.h' file not found

include "libxml/xmlversion.h"

I had encountred this type of errors. In most cases installing development package of shared libraries the module requires fix it.

In Debian libxml2-dev has all the header files of libxml2 pacakge. libxml2:amd64/jessie 2.9.1+dfsg1-5 uptodate libxml2-dev:amd64/jessie 2.9.1+dfsg1-5 uptodate

lxml module requires libxml2-dev and libxslt1-dev.