I use Slackware (14.0), and did not have /etc/crontab. Also, anacron is not part of the distribution.
The solution on my system was as simple as running crontab -l as root:
root@flea:~# crontab -l# If you don't want the output of a cron job mailed to you, you have to direct# any output to /dev/null. We'll do this here since these jobs should run# properly on a newly installed system. If a script fails, run-parts will# mail a notice to root.## Run the hourly, daily, weekly, and monthly cron jobs.# Jobs that need different timing may be entered into the crontab as before,# but most really don't need greater granularity than this. If the exact# times of the hourly, daily, weekly, and monthly cron jobs do not suit your# needs, feel free to adjust them.## Run hourly cron jobs at 47 minutes after the hour:47 * * * * /usr/bin/run-parts /etc/cron.hourly 1> /dev/null## Run daily cron jobs at 4:40 every day:40 4 * * * /usr/bin/run-parts /etc/cron.daily 1> /dev/null## Run weekly cron jobs at 4:30 on the first day of the week:30 4 * * 0 /usr/bin/run-parts /etc/cron.weekly 1> /dev/null## Run monthly cron jobs at 4:20 on the first day of the month:20 4 1 * * /usr/bin/run-parts /etc/cron.monthly 1> /dev/null