Build

The best way to build from source (latest version) is SlackBuilds.org

If for some reason you want to build master branch:

1. git clone https://github.com/rizitis/slackpkg-update-notify.git
2. cd slackpkg-update-notify/SlackBuild || exit 1
3. su -c "bash slackpkg-update-notify.SlackBuild"
4. su -c "upgradepkg --install-new --reinstall /tmp/slackpkg-update-notify-1.0-noarch-1_custom.txz"

After installation finish as root:

paste these lines in /etc/rc.d/rc.local

# Slackpkg update notify
if [ -x /usr/bin/slk-changelog-check ]; then
logger -t rc.local "starting slk-changelog-check"
echo "starting slk-changelog-check"
sleep 120 && /usr/bin/slk-changelog-check &
fi

create if not exist a /etc/rc.d/rc.local_shutdown copy paste in:

#!/bin/bash
#
# Remove slk-notify lock file from /tmp
if [ -f /tmp/slk-notify.lock ]; then
    rm -f /tmp/slk-notify.lock
fi

chmod +x /etc/rc.d/rc.local_shutdown

Optional: run every 6 hours via cron

By default slk-changelog-check runs once at boot from rc.local.
If you want it to also check every 6 hours, add a cron job as root:

su -
crontab -e

Add this line:

0 */6 * * * /usr/bin/slk-changelog-check

Save and exit. Verify it was added:

crontab -l

You can watch behavior from /var/log/messages something like this:

cat /var/log/messages | grep slk

May 2 16:56:24 hackbox rc.local: starting slk-changelog-check
May 2 16:58:24 hackbox slk-changelog-check: Fetched 3 lines from ChangeLog.
May 2 16:58:24 hackbox slk-changelog-check: No changes detected.

---

Binary

A noarch slackware package ready for installation might exist on Releases
if so, you can download and use it for installation

# upgradepkg --install-new --reinstall slackpkg-update-notify-*-noarch-1_custom.txz

But build and install from source is always preferred