If you read the README file in openerp-server you'll notice the following line:

The dependencies are listed in setup.py

Search install_requires in setup.py and you'll find the list of python libraries.

The current one:

  install_requires = [
      'pychart', # not on pypi, use: pip install http://download.gna.org/pychart/PyChart-1.39.tar.gz
      'babel',
      'docutils',
      'feedparser',
      'gdata',
      'Jinja2',
      'lxml', # windows binary http://www.lfd.uci.edu/~gohlke/pythonlibs/
      'mako',
      'mock',
      'PIL', # windows binary http://www.lfd.uci.edu/~gohlke/pythonlibs/
      'psutil', # windows binary code.google.com/p/psutil/downloads/list
      'psycopg2',
      'pydot',
      'python-dateutil < 2',
      'python-ldap', # optional
      'python-openid',
      'pytz',
      'pywebdav',
      'pyyaml',
      'reportlab', # windows binary pypi.python.org/pypi/reportlab
      'simplejson',
      'unittest2',
      'vatnumber',
      'vobject',
      'werkzeug',
      'xlwt',
  ],     
  extras_require = {
      'SSL' : ['pyopenssl'],
  },
  tests_require = ['unittest2'],

Note that some addons may need additional libraries (like google_docs which requires gdata for example).