Comments - Riboshom

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.