Missing dependencies for datapusher in a CKAN production install

Hi, I've made a fresh installation of CKAN 2.4.1 in ubuntu 12.04, following steps of http://docs.ckan.org/en/latest/maintaining/installing/install-from-package.html
However some dependencies were missing for datapusher, despite the note included in http://docs.ckan.org/projects/datapusher/en/latest/deployment.html
`Starting from CKAN 2.2, if you installed CKAN via a package install, the DataPusher has already been installed and deployed for you. You can skip directly to CKAN Configuration.`

I've installed several packages python-lxml python-dev libxml2 libxml2-dev libxslt-dev but I think just libxml2-dev libxslt-dev are needed.

Please also note that "package install" anchor in http://docs.ckan.org/projects/datapusher/en/latest/deployment.html gives 404.

Regards
Ariel