I have downloaded the sources from debian wireshark , even I have compiled it when I tired to install the patch ...
I compiled a new wireshark (based on the 1.4.2 sources, but from svn/git will probably be easier) this week end and the patch may not apply totally cleanly and you will need tweaks and such ...
Totally new dissectors might also require a autoreconf -i (so you'd better know autotools and how to solve those issue as well, google for it)
But any decent programmer should have no trouble fixing all that by himself. All this is provided "AS-IS" and making it work for your specific setup is up to you.
Cheers,
Sylvain