Good news. The Xenial instructions will be very simple, assuming we trust a PPA for db4.8. I've actually used that PPA in the past to install bitcoin core. It's kind of funny how all the bitcoin related PPAs say you shouldn't trust them.
Once I installed that along with all the other dependencies, I just did
./autogen.sh
./configure --with-pic
and it compiled fine with built in gcc 5.4. There were plenty of warnings, but it compiled and is syncing now. Used qt4 although I'm curious if qt5 will work.
That's great news. I was getting those errors on QT5. I've chased down the reason and its pretty sticky. If QT4 builds with no problems we are in good shape.
What do you think of using the PPA?
PPA's are my friend.