I've not managed to track down how yet (ever?), but in two of my upgraded directory trees the etc/rc.d/nuageinit ended up being missing.
By contrast, the places that were filled in via "installworld distrib-dirs distribution DB_FROM_SRC=1" usage did have the file. (Installed from the same build.) Note, I noticed because of a message from an etcupdate run: I do not use the file for anything. === Mark Millard marklmi at yahoo.com