ansible pip install lxml

pip requirements

- name: Install lxml requirements
  apt: "pkg={{ item }} state=present update_cache=yes"
  sudo: yes
  with_items:
    - python-dev
    - libxml2
    - libxml2-dev
    - libxslt1-dev
    - lib32z1-dev
    - libssl-dev
    - zlib1g-dev

- name: install lxml
  command: {{ path/to/virtualenv/bin/ }}pip install lxml
  environment:
      CFLAGS: "-O0"

for ubuntu run this from inside your virtualenv

sudo apt-get install python-dev libxml2 libxml2-dev libxslt1-dev lib32z1-dev libssl-dev zlib1g-dev && CFLAGS="-O0" && pip install lxml