Annoyingly large amount of non-productive time today. First I went and renovated the Makefiles for all my Postgres extensions, having originally copied a piece of bad logic from somewhere into almost all of them. This was exposed by a change in the HEAD branch of Postgres that's about to be reverted, but it seemed best to remove the bogus logic anyway.
Then, for no apparent reason, Xfce forgot to load xfwm4 on one of my machines, and suddenly I had lost all my window decorations - no buttons to close or minimize windows, no icons in the window button bar, etc. That took me an hour or more to diagnose and fix.
All this is delaying my slide preparation for pgcon :-(