So I had a couple of scotches last night and then got distracted, but I currently have a complete build of Asterisk 13.4 with PJSIP for the Pi. I haven’t tested it, but it seems to be for the correct CPU and everything. I’ll copy it across to the Pi later.
I expect I’ll just publish a .tgz that people can extract to the root of their Pi that has all the required bits in it to get asterisk up to date, and then they can just do a normal FreePBX install.
(The current FreePBX install instructions, once you have the prerequisites installed, is pretty much just ‘./install -n’ which makes things nice and easy for everyone!)