Upgrading IPFilter on 2.9

["Geoff Sweet" <larryboy2k@attbi.com>]

I am running OBSD 2.9 and am trying to upgrade to IPFilter 3.4.25.  I am
sure my problems here are because of my lack of experience with OpenBSD,
buuut it appears that it is only intended for OBSD 3.0.  I tried the walk
through's and some of the tutorials on the web, but they all always come
back to this:

gate# patch < /home/geoff/ip_fil3.4.25/OpenBSD/3.0-sys-diffs
Hmm...  Looks like a new-style context diff to me...
The text leading up to this was:
--------------------------
|diff -cr sys.30/arch/alpha/alpha/conf.c sys/arch/alpha/alpha/conf.c
|*** sys.30/arch/alpha/alpha/conf.c     Fri Sep 28 13:33:39 2001
|--- sys/arch/alpha/alpha/conf.c        Fri Dec 28 12:42:32 2001
--------------------------
File to patch:

Unless I am mistaken... this isn't working right?  What is the work around
for this?  There isn't a "2.9-sys-diffs" file to point at in the IPFilter
directory.  Your assistance is greatly appreciated.

Thank-you
Geoff