Among others these lines appear in the file:
auth,authpriv.* /var/log/auth.log
*.*;auth,authpriv.none -/var/log/syslog
#cron.* /var/log/cron.log
#daemon.* -/var/log/daemon.log
What is the purpose of the leading "-" in the path? It doesn't seem to be documented in the manpage and I can't figure it out.