gotcha, I couldn't get it to compile on ubuntu. I built & installed bdb in /usr and that worked, but then i got an error during make:
qt/masternodelist.cpp:193:172: error: class QDateTime has no member named offsetFromUtc
I haven't built the GUI from source, but the command line tools compiled fine for me. Did you follow their guide at
https://github.com/biblepay/biblepay/blob/master/doc/build-unix.md ? Make sure you have the required optional dependencies for the GUI if you're missing them, then run configure and make again.