FreeRADIUS and Active Directory

Dear all, I'm trying to setup my FreeRADIUS to verify user credentials from windows AD (at the moment I'm using users file). I have no experience in joining Linux based machine to windows domain, I had a look at few guides and found that the easiest way is to use "likewise-open". I've joined my radius server to the domain and noticed that likewise did not use samba's winbind or ntml_auth. Which according to wiki I've been reading is a must to enable authentication using AD. http://wiki.freeradius.org/FreeRADIUS_Active_Directory_Integration_HOWTO Can I install winbind and samba manually, or should I start again and not use likewise-open at all? Thanks for your help! Tomas