I am using the 184.108.40.206 kernel under Debian Lenny.
I have tried downloading the 0.9.4 version on the madwifi site and have tried to
make it. I have also followed the guide on the madwifi site to use the module
assistant (http://madwifi-project.org/wiki/UserDocs/FirstTimeHowTo) however both
methods have failed.
In case its related, I did install the headers when I compiled my kernel.
Problem fixed by downloading the latest madwifi source via subversion.
I saw someone else earlier had the same problem with a kernel close to the one I
was using and gave it a shot, it worked.