using procmail with qmail+/Maildir+vpopmail

[qmail]

hi all!

i've got troubles and a question :)
i can't manage to install procmail. currently i am using qmail-local to
deliver mails. i also use the /Maildir format and vpopmail. i couldn't find
a howto or documentation how to install procmail with
qmail+maildir+vpopmail. hope you can help me!

thx in advance

greets
michael