[pf4freebsd] pf backport to freebsd 4.x?

[DrumFire]

Hi all,

first of all, I'd like to thank you for the great job that you
have done to port pf on FreeBSD 5.x.

It's possible to port pf on FreeBSD 4.x also?

When I propose to some people to try pf as packet filter, they
answer me that can't, because their use a 4.x stable branch as
firewall instead of a 5.x branch.
So if you can port pf on a 4.x branch, I think that more people
will try pf :)