install rails plugins when behind a proxy

Hi,

I'm behind a proxy server and I can't seem to install any rails
plugins
Whenever I'm trying to install a plugin I get this

      exists
      create app/controller
File exists - script/plugin

which I guess means that it just didn't find the plugin.
I managed to configure gem and install rails using the http_proxy
enviroment variable.
But for ruby script/install this doesn't seem to work.

Any ideas?

thanks
Marc

actually the problem seems to be that the http_proxy variable works
only for http connections.
However, if the plugins SVN resides on a url like svn:// ..... it
won't use the proxy server specified in the http_proxy variable.
I have no idea how to get around that.