When playing ROTT in Linux the game screen is surrounded on all sides by a large blank (black) border.
Any idea how to get rid of it?
In windows you could just use a source port like Winrottgl. There is SDLrott for Linux, which might work if you can figure out how to compile it. http://icculus.org/rott
If you're using dosbox, this video may help you with zooming in to fill the screen. https://youtu.be/vceKXW617e0