This manpage is starting to get stale, but parts of it are fit for
integration in `README.md` (e.g., the introduction and some details of the
listing of the options).
From the "updated" `README.md` file, we can probably use a tool to generate
a very fine and detailed manpage that is always in sync with the program.
Many systems (including Debian, Ubuntu and derivatives like Linux Mint) use
Dash as a noninteractive version of `/bin/sh`, invoked by `make`.
Dash's `echo` command doesn't understand the `-e` option and this generates
spurious output when running `make`. See [a bugreport][0] for one of the
many instances of this bug/feature in action.
[0]: https://bugs.launchpad.net/ubuntu/+source/dash/+bug/72167