src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
Question:   1. I am running the following comand for installing the packages in that file " `pip install -r requirements.txt --download-cache=~/tmp/pip-cache`".

  2. requirement.txt contains pacakages like 

    
    
    # Data formats
    # ------------
    PIL==1.1.7 # 
    
    html5lib==0.90
    httplib2==0.7.4
    lxml==2.3.1
    
    # Documentation
    # -------------
    Sphinx==1.1
    docutils==0.8.1
    
    # Testing
    # -------
    behave==1.1.0
    dingus==0.3.2
    django-testscenarios==0.7.2
    mechanize==0.2.5
    mock==0.7.2
    testscenarios==0.2
    testtools==0.9.14
    wsgi_intercept==0.5.1
    

while comming to install "lxml" packages i am getting the following eror

    
    
    Requirement already satisfied (use --upgrade to upgrade): django-testproject>=0.1.1 in /usr/lib/python2.7/site-packages/django_testproject-0.1.1-py2.7.egg (from django-testscenarios==0.7.2->-r requirements.txt (line 33))
    Installing collected packages: lxml, Sphinx, docutils, behave, dingus, mock, testscenarios, testtools, South
      Running setup.py install for lxml
        Building lxml version 2.3.1.
        Building without Cython.
        ERROR: /bin/sh: xslt-config: command not found
    
        ** make sure the development packages of libxml2 and libxslt are installed **
    
        Using build configuration of libxslt
        building 'lxml.etree' extension
        gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-i686-2.7/src/lxml/lxml.etree.o -w
        In file included from src/lxml/lxml.etree.c:239:0:
        src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
        compilation terminated.
        error: command 'gcc' failed with exit status 1
        Complete output from command /usr/bin/python -c "import setuptools;__file__='/root/Projects/ir/build/lxml/setup.py';execfile(__file__)" install --single-version-externally-managed --record /tmp/pip-SwjFm3-record/install-record.txt:
        Building lxml version 2.3.1.
    
    Building without Cython.
    
    ERROR: /bin/sh: xslt-config: command not found
    
    
    
    ** make sure the development packages of libxml2 and libxslt are installed **
    
    
    
    Using build configuration of libxslt
    
    running install
    
    running build
    
    running build_py
    
    copying src/lxml/cssselect.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/__init__.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/sax.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/pyclasslookup.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/usedoctest.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/doctestcompare.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/_elementpath.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/ElementInclude.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/builder.py -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/html/clean.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/__init__.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/_dictmixin.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/ElementSoup.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/usedoctest.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/defs.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/builder.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/_html5builder.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/diff.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/html5parser.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/_diffcommand.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/_setmixin.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/soupparser.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/html/formfill.py -> build/lib.linux-i686-2.7/lxml/html
    
    copying src/lxml/isoschematron/__init__.py -> build/lib.linux-i686-2.7/lxml/isoschematron
    
    copying src/lxml/etreepublic.pxd -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/tree.pxd -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/etree_defs.h -> build/lib.linux-i686-2.7/lxml
    
    copying src/lxml/isoschematron/resources/rng/iso-schematron.rng -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/rng
    
    copying src/lxml/isoschematron/resources/xsl/XSD2Schtrn.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl
    
    copying src/lxml/isoschematron/resources/xsl/RNG2Schtrn.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_svrl_for_xslt1.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_message.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_schematron_skeleton_for_xslt1.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_abstract_expand.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/iso_dsdl_include.xsl -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    copying src/lxml/isoschematron/resources/xsl/iso-schematron-xslt1/readme.txt -> build/lib.linux-i686-2.7/lxml/isoschematron/resources/xsl/iso-schematron-xslt1
    
    running build_ext
    
    building 'lxml.etree' extension
    
    gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m32 -march=i686 -mtune=atom -fasynchronous-unwind-tables -D_GNU_SOURCE -fPIC -fwrapv -fPIC -I/usr/include/python2.7 -c src/lxml/lxml.etree.c -o build/temp.linux-i686-2.7/src/lxml/lxml.etree.o -w
    
    In file included from src/lxml/lxml.etree.c:239:0:
    
    src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory
    
    compilation terminated.
    
    error: command 'gcc' failed with exit status 1
    
    ----------------------------------------
    Command /usr/bin/python -c "import setuptools;__file__='/root/Projects/ir/build/lxml/setup.py';execfile(__file__)" install --single-version-externally-managed --record /tmp/pip-SwjFm3-record/install-record.txt failed with error code 1
    Storing complete log in /root/.pip/pip.log
    

Can anyone check and guide me what would be the problem and why?Any package
missing to install.


Answer: Install libxslt-devel & libxml2-devel using

    
    
    sudo apt-get install libxml2-dev libxslt1-dev
    

After installing follow the above one

