> Does LIBGL_ALWAYS_SOFTWARE=1 help?
No, that did not happen to help. However when running remotely on my OS X system using XQuartz I was able to get it working by running this command
defaults write org.xquartz.X11 enable_iglx -bool true
Apparently, the latest version of XQuartz (X Server for OS X) do not have glx enabledby default.
There was nothing wrong or misconfigured on the NetBSD system running the game.