This SlackBuild packages up the Sentry tools logcheck script, a utility for
watching logs for suspicious activity. (The script can be found at
https://sourceforge.net/projects/sentrytools/). Be sure to edit
/usr/local/etc/logcheck.sh to enter the email addresses for root and the
sysadmin who will receive the reports. Also add an entry to root's crontab as, e.g.,

# Run logcheck every ten minutes
05,15,25,35,45,55 * * * * /usr/local/etc/logcheck.sh 1> /dev/null

