The game "pioneers" calls the "beep" utility in order to signal a turn
change, and gives a (non-fatal) error message if beep is not installed.
I confirmed beep is available as a guix package.
christopher@nightshade ~$ guix describe
Generation 2 Feb 25 2021 21:06:30 (current)
guix 6294299
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 62942992831249d6d1c047c0a11c41d2ecccc4fc
--
Christopher Howard
phone: (907) 374-0257 (landline)
blog: https://librehacker.com
social: https://gnusocial.club/librehacker
