ERROR: /bin/sh: 1: xslt-config: not found

Fix
=====
sudo apt-get install libxml2-dev
sudo apt-get install libxslt1-dev
sudo apt-get install python-dev
  
Error
=====
Running setup.py install for lxml
    /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
      warnings.warn(msg)
    Building lxml version 3.4.4.
    Building without Cython.
    ERROR: /bin/sh: 1: xslt-config: not found
   
    ** make sure the development packages of libxml2 and libxslt are installed **
   
    Using build configuration of libxslt
    building 'lxml.etree' extension
    x86_64-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/tmp/pip_build_root/lxml/src/lxml/includes -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-x86_64-2.7/src/lxml/lxml.etree.o -w
    In file included from src/lxml/lxml.etree.c:239:0:
    /tmp/pip_build_root/lxml/src/lxml/includes/etree_defs.h:14:31: fatal error: libxml/xmlversion.h: No such file or directory
     #include "libxml/xmlversion.h"
                                   ^
    compilation terminated.
    error: command 'x86_64-linux-gnu-gcc' failed with exit status 1
    Complete output from command /usr/bin/python -c "import setuptools, tokenize;__file__='/tmp/pip_build_root/lxml/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-MD0kwd-record/install-record.txt --single-version-externally-managed --compile:
    /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'

  warnings.warn(msg)

Building lxml version 3.4.4.

Building without Cython.

ERROR: /bin/sh: 1: xslt-config: not found

** make sure the development packages of libxml2 and libxslt are installed **


In file included from src/lxml/lxml.etree.c:239:0:

/tmp/pip_build_root/lxml/src/lxml/includes/etree_defs.h:14:31: fatal error: libxml/xmlversion.h: No such file or directory

 #include "libxml/xmlversion.h"

compilation terminated.

error: command 'x86_64-linux-gnu-gcc' failed with exit status 1