exo-notify contains the exo-mount-notify binary that is created when
compiling exo against libnotify. All other exo files are included in
the official Slackware Xfce package.

libnotify (available at SBo) is required to build exo-notify.

NOTE: The version of exo used to build exo-notify must match the
version of exo included with Slackware's Xfce package.