Ports dependent upon libxul

[Super Biscuit]

 First, I'd like to say thank you for the svn link. It took about eight or nine hours- I fell asleep while waiting- for it to build but it did. Seems that 400 MHZ and 386M are just enough to build it. I did it with the -j 2 flag.
When I compile ports and one breaks due to a dependency on RELEASE libxul, do I just find the part in question and edit the file to accept the new libxul?
Also, I would like to know if I could ever build packages- firefox, libxul, others- and submit them to a repository. The reason would be to make the installation process for others to be easier.
 Again, thank you for your time and for letting me get and use the software and links.