In case you're wondering how to use this just like me:

download the 3 files here and store them in
/usr/portage/net-wireless/madwifi-ng/files

edit /usr/portage/net-wireless/madwifi-ng/madwifi-ng-0.9.2.ebuild

Where it says
epatch ${FILESDIR}/madwifi-ng-uudecode-gcda-fix.patch

add (below that line)
epatch ${FILESDIR}/madwifi-ng-0.9.2-config.h.diff
epatch ${FILESDIR}/madwifi-ng-0.9.2-crypto_cipher_encrypt_one.diff
epatch ${FILESDIR}/madwifi-ng-0.9.2-ath_intr.diff

run
ebuild /usr/portage/net-wireless/madwifi-ng/madwifi-ng-0.9.2.ebuild digest 



emerge should now work

This is in no way official, i know dick-shit about ebuilds and am otherwise
a total moron (thus read, in no way hold me responsible for whatever goes
wrong, now in or in the future :D)