Lesson for the day: Seg faults are bad. Seg faults during an installation probably indicate that something Very Bad has happened, and you’re probably better off trying to get the install to work without that seg fault.
As you might be able to guess, the re-install didn’t go as smoothly as planned. However, 24 hours or so later, everything looks to be basically on track. I’m editing this file from Emacs in KDE, while WindowMaker compiles in the background. I got PPP dialup to work the first time, so I can upload this file. Life is good!