SlackBuild 'XnViewMP' bombs

Build the SlackBuild 'XnViewMP' for 14.2 on my x86-64 / multilib system. Package says is installed in /var/log/packages. However, no binary in /usr/bin or /usr/sbin. There *IS* a folder now - /opt/XnView - but none of the binaries in there will execute, giving error,

'XnView: error while loading shared libraries: libopenal.so.1: cannot open shared object file: No such file or directory'

Apparently this Slackbuild is missing some hints or explaination which might help with initializing or running first-time.

jrc