Aparently it wants to use Oss, but you don’t have the alsa oss emulation enabled.
But normally supertuxkart should just use Alsa or Pulseaudio.
Maybe you have set openal to use oss?
Could you post /etc/openal/alsoft.conf and ~/.alsoftrc (if it exists)?
If pulseaudio is enabled (which it is by default on openSUSE) “drivers=pulseaudio,alsa” might be better (I added that to my previous post, I guess you missed it…).
But an empty file (or none at all) is even better anyway, as openAL then just tries all drivers it knows and uses the first one that works.