title: Issue installing lxml on Ubuntu 10.04.4
body: <p>I am trying to install "lxml" on my Ubuntu 10.04.4 and getting the following error:</p>
  
  <pre><code>root@buildxxxx:~# easy_install lxml
  install_dir /usr/lib/python2.7/site-packages/
  Searching for lxml
  Reading http://pypi.python.org/simple/lxml/
  Best match: lxml 3.4.4
  Downloading https://pypi.python.org/packages/source/l/lxml/lxml-    3.4.4.tar.gz#md5=a9a65972afc173ec7a39c585f4eea69c
  Processing lxml-3.4.4.tar.gz
  Running lxml-3.4.4/setup.py -q bdist_egg --dist-dir /tmp/easy_install- hswCIi/lxml-3.4.4/egg-dist-tmp-D4CPP_
  Building lxml version 3.4.4.
  Building without Cython.
  Using build configuration of libxslt 1.1.26
  Building against libxml2/libxslt in the following directory: /usr/lib
  /usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'bugtrack_url'
  warnings.warn(msg)
  src/lxml/lxml.etree.c:16:20: error: Python.h: No such file or directory
  src/lxml/lxml.etree.c:18:6: error: #error Python headers needed to compile C    extensions, please install development version of Python.
  error: Setup script exited with error: command 'gcc' failed with exit status 1
  </code></pre>
  
  <p>I am using Python 2.7.3 version and already tried installing libxml2-dev libxslt1-dev python-dev but I already had these in my system.</p>
  
  <p>Any idea?</p>