environment empty after scanning path

Hi,

i have a little problem with pkg_resources.
I would like to load eggs from a path, but once i add the path to the environment, it is empty. The code looks like this:

import pkg_resources

PATH = "/path/to/my/egg-folder"

pkg_resources.working_set.add_entry(PATH)
env = pkg_resources.Environment([PATH])

Now, if i want to iterate through env entries, it turns out to be completely empty, zero entries.
This is independent of the path i use and also independent of how i invoke it (python cli, ipython, from gnome env, etc.)
Does anyone have any idea on how to make this work?

Thanks,
Markus 
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