Use your own Rails library

I want to add my rails Library to my Application, so everybody who runs
ruby on his or her web server, could install my Applications and
configure the database and everything just works fine. So saved my rails
with all the extensions and further gems inside and saved everything
inside my rails application. The only problem how to tell the web server
to use the gems shipped with the application! Where is the configuration
file to change that ? Please help ?
regrades Snoop1990