applying big-todo patch

[Brett]

I'm aware of this page on qmail.org:
http://www.qmail.org/big-todo.103.patch. What I don't see is a fast way of
applying these changes. I can can go through the files and take out and
replace the relevant lines but isn't there an automated script I can run
that will do this for me? Where is this script? I've searched the archives
and while there's plenty of talk about the big-todo patch, nobody ever
mentions exactly what they did to apply it. Thanks a bunch.