Hi,
I updated the virtual system we offer for download for people who want to do some patches to Huggle, but don't want to spend time settings up a full featured C++/Qt development environment capable of compiling Huggle.
The link is here: https://petr.insw.cz/huggle/huggle.ova
You need virtual box to import it. It's a stripped down Ubuntu 18 LTS, with several packages removed (games, video player, etc) that has preinstalled all packages needed, with Huggle source codes downloaded and preconfigured in Qt Creator, so in order to compile Huggle from latest code you need to just import this VM and launch it.
I updated the old image, so please test this one and let me know if there is any issue before I push it to wikimedia cloud.