OpenAL is automatically installed with the game, I don't think you need to do that.Have you tried using Wine yet?
https://stackoverflow.com/questions/11195372/how-to-install-openal-sdk-on-ubuntuAlternatively, you can download OpenAL here https://www.openal.org/downloads/ and run the windows download through wine
sudo pacman -S openal
Audio driver might not be installed correctly (not openal) - I am not familiar with linux problems so I try to help the best as I can do