On 03/19/2018 05:03 AM, Anthony Walter via Lazarus wrote: > Building on Ubuntu 16.04. Any suggestions? Probably you're using Qt5 lib < 5.6. AFAIR Ubuntu 16.04 have Qt-5.5 by default (same as mint 18.3), I've successfully installed Qt5 5.6.1 from some ubuntu repo and it works like a charm. zeljko