For the OP's question: the site http://www.qmailrocks.org/ has some very detailed step-by-step instruction sets, including FC1 and FC2 specific sets.
There's also http://www.lifewithqmail.org/lwq.html
And you can get the 'netqmail' sources which come with all the errno patches you need (you have to apply them).
-- John C. Nichel ÜberGeek KegWorks.com 716.856.9675 john@xxxxxxxxxxxx