Yes the joys of QT. I am sure it is good but seems to me to be far too clever for its own good. I lost the executable lbr2svg going to Ubuntu 14.04. So to get it back I did the following ( Not sure what I needed to do but this worked for me )
Installed qtcreator: sudo apt-get install qtcreator.
Tried adding QT += widgets to the pro file - still had errors missing xml errors so sudo apt-get install libqt5xmlpatterns5-dev
Then qmake lbr2svg.pro followed by make.
So basically google for the errors. lbr2svg was created with QT4 and there are issues with QT5 that need to be got round.
I have put both executables in a dropbox directory. Not sure if they will work standalone but give it a try https://www.dropbox.com/sh/9ncsa3jrefcx93n/AACStMUNZXIZ891O4I5dOLKwa?dl=0