Trying to use the quake2demo extension in the tc-10.x x86 repo: $ quake2
using /home/tc/.quake2/baseq2/ for writing
couldn't exec default.cfg
couldn't exec aprconfig.cfg
Console initialized.
------- sound initialization -------
Starting SDL audio callback...
SDL audio initialized.
sound sampling rate: 22050
------------------------------------
--------- [Loading Renderer] ---------
Using libGL.so for OpenGL...setting mode -1: 0 0
Error: Couldn't load conchars.pcx