[Therion] epsg:3794 - PROJ4 library: -1 (no arguments in initialization list)

Hello, I'm trying to compile a therion config and am getting the following error: therion: error -- PROJ4 library: -1 (no arguments in initialization list) The repo and file I'm attempting to compile: https://github.com/tr1813/migresurvey/blob/master/data/_config/overview/syst... This works for for someone on OSX and another on Windows but not for me on Ubuntu 20.04. I tried searching for the error but there wasn't anything enlightening. It compiles if I comment out "epsg:3794" so I'm guessing perhaps my version of the proj library does not have this coordinate system? Could I build a more up to date version? Can anyone point me in the right direction? Thanks, Rhys