After I created the symlink as mentioned in the LQ post (above), the installer executed and completed.
I haven't yet installed the dependencies for the game to run yet.
I expect to be able to get them using sbopkg and the Slackbuilds repository.
However, I'm going to make a note here about pre-built Slackware packages that aren't included with the Slackware distribution.
Here is a repo of many such packages, and other Slack-related scripts and information:
http://www.slackware.com/~alien/Hi! I am Eric Hameleers, or Alien BOB as I am called on various Slackware forums & channels. I am a long time Slackware user, part of the Slackware team, but I am not a Slackware employee. You'll find scripts I wrote here, lots of Slackware packages, their build scripts, and several articles I wrote for my Wiki of course.
All of what I make available here is not official Slackware-released software. Do not bug Pat about what you download from my homepage (other than to tell him he should include my packages in the official Slackware distribution if you like them :-)