Subject:   -28- I reinstalled an IRIX subsystem to restore a missing
                file or get rid of a corrupted file, but it didn't help.
                Why not?
Date: 13 Apr 1994 00:00:01 EST

  'inst' doesn't bother to install a subsystem if the same or a newer
  version is already installed. Tell it to install anyway by saying
  'set neweroverride' before you say 'go'. Removing the subsystem and
  reinstalling it will do more or less the same thing.