Bug#967284: castle-game-engine: depends on deprecated GTK 2

[Bastian Germann]

On Sun, 9 Aug 2020 23:01:12 +0200 Michalis Kamburelis wrote:

Upgrade to GTK3 is planned.

Would it be possible to build with qt5 instead? From a Debian packaging 
perspective,
this should already work as opposed to gtk3.