In a tool_dependency.xml file I want to install python package lxml in a
virtual environment, as a tool I'm building needs it. The python lxml
package requires the libxml2 tool dependency. I have added a
set_environment_for_install action that refers to the libxml2 repository,
but when python/pip tries to install lxml it fails, apparently because it
can't find the required headers. This appears to be because the
setup_virtualenv action does not include install environment variables.

It seems to me that install environment variables should be sourced for
every following action that can do nontrivial things, not just shell

Alternatively, am I trying to install lxml the wrong way, is there a better
way? (I'm running on python 2.6)

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