The App-orgdaemon distribution provides the "org-daemon" program, a
Perl/Tk application which sits in the background and "warns" about
appointments found in configured Emacs org-mode files.
Installation:
perl Makefile.PL
make
make test
make install
Installation without downloading the distribution:
cpan App::orgdaemon
or
cpanm App::orgdaemon
You can use the org-daemon script found in the bin subdirectory also
directly, without installation. Make sure that at least Perl/Tk is
installed. On a Debian based system this dependency could be installed
using