I think I now know how /usr vanished. While doing something with /cygwin via Windows, a faulty mouse motion moved /cygwin/usr to another directory under /cywin/c . /usr was still there but invisible to me. (I should have run a giant 'find' or such to locate it, but didn't.)
I found the hidden /usr *only after downloading /cygin from scratch*. Because I backed up (or rather just renamed the old /cygwin to be /cyglose ) I now have the choice of which download to use! If I can complain a little, I found the download defaults to be faulty. Tiny standard packages like 'bc', 'more' and some others should be loaded by default. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple