The default is to install the binary and man page into /usr and to look for
the global config in /etc.
If you wish to install entirely into /usr/local, do the following:
make PREFIX=/usr/local CONF=/usr/local/etc/ondirrc install
To install to a "package root" do this:
make DESTDIR=/tmp/ondir.pkg install
Once you have installed OnDir, add either scripts.sh or scripts.tcsh to your
startup. This will execute ondir whenever you change directories at the shell.