You have to install either Pulseaudio (works great on arch linux, default in ubuntu (maybe it needs some tweaking)
The main problem is openal!
http://wiki.archlinux.org/index.php/PulseAudio#Configuration_of_OpenAL_for_PulseAudioCheck this link maybe it siutes you distro to. Another option is use jack or artsd.
Which distro do you have?