You're probably stuck compiling then; fortunately you managed to do that with a nightly version already, which means any other versions are simply a matter of waiting for your compiler. I get the impression that the mentality around the forums is that if you're running linux, it's assumed you know how to compile from source anyways.
Joke, but... I spent 2 days for compilation and solving problems and I think my mental health is not good at final and I should relax during next 2 days. Good result!!! When new nightly version will come I have to schedule 4 days for new compilation and new achievements, because I have nothing to do outside of compilation. I am very unhappy, because there is https://knapsu.eu/openxcom/ where I can simple download the .deb package for Debian and run the 1.0 version of game without problem and without adventures. This is really not good. I wonder, for that purpose there are software repositories and .dep packages if all can be compiled? Did you compiled your system from scratch?
It was first time when I compiling something on my Debian and I think it was last time... I believe that 20 years ago it was a regular practice but today I am afraid that nobody in good health can afford to do that, because there are no masochists here.