GZDoom 3.6 for rpi4: if it need some lib than you dont have...just install it! remember to use tab to find it "sudo apt install lib"... initials...and do tab to search!! https://drive.google.com/file/d/11oyt... My mesa: it could help you on other games/emulators https://drive.google.com/file/d/1RzoE... *with master mesa (my mesa) it will resolve graphics but it crash when exit, so, you config will not be saved...but you can edit it on /home/pi/.config/gzdoom/ *also, to load mods, you had to edit that file to load them!! Also, set your desktop resolution to 720p...seems than the game cant find the way to do that. Thats for having persistent 60 fps. cheers!