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PS (can't edit) : This may not work depending on where you installed desura. If so, just change /home/$USER/stuff by the path of your desura folder followed by "common/frozen-synapse".
I'd rather recommand :
locate libopenal.so.1 | grep /usr/lib
and if that line returs something, go ahead and type this :
ln -s `locate libopenal.so.1 | grep /usr/lib | head -1` /home/$USER/FrozenSynapse/lib/libopenal.so
Otherwise, install the package:
sudo apt-get install libopenal-dev
Little corrections that make it easier, faster, and more automagic.