yum.conf proxy= and env http_proxy=

Hi,

I have a yum.conf that contains a proxy=_None_ in [general] and a
local rpm repository.

However, when I run yum on a system that has http_proxy=<something> in
the environment, this is used instead.

Is there a way to disable yum's usage of the http_proxy environment variable?
(pref.  with a config option in the yum.conf?

Best regards,

Jeroen Janssen