I got this error:
build/compat_libevent.o: In function `tor_gettimeofday_cache_clear':
/home/leigh/build-britcoin-qt-Qt_4_8_6_in_PATH_qt4-Debug/../britcoin3.3/src/tor/compat_libevent.c:638: undefined reference to `event_base_update_cache_time'
collect2: error: ld returned 1 exit status
make: *** [britcoin3.3.0.2] Error 1
21:10:13: The process "/usr/bin/make" exited with code 2.
Error while building/deploying project britcoin-qt (kit: Qt 4.8.6 in PATH (qt4))
When executing step "Make"
So you're compiling the GUI then? Try just the britcoind (in the src folder) first; see how that goes.
QT 4.8.6, that's strange. You want to be using something between QT 5.2 and 5.5.
For the GUI, you might need:
sudo apt-get install libqt5gui5 libqt5core5a libqt5dbus5 qttools5-dev qttools5-dev-tools
EDIT: You may also need libevent for either daemon or GUI, though that was already in the instructions:
sudo apt-get install libevent-dev