Matthew Justin Bauer bee228d9b4 exult: only build on linux ...

It currently times out on finding sdl-config:

https://hydra.nixos.org/job/nixpkgs/staging/exult.x86_64-darwin

2018-06-23 19:08:32 -04:00

..

arch.patch

…

default.nix

exult: only build on linux

2018-06-23 19:08:32 -04:00