http://gambaswiki.org/bugtracker/edit?object=BUG.908&from=L21haW4- Comment #16 by Benoît MINISINI: I have just installed Kubuntu 16.04, with Qt 5.5.1, and everything compiles correctly. I don't know if Qt 5.6 is provided for Ubuntu... Benoît MINISINI changed the state of the bug to: Upstream.