The RSS feed on the Slackbuilds website is currently broken. There are
date-related php warnings being emitted at various points, resulting in
$ wget -q -O - http://slackbuilds.org/rss/ChangeLog.rss
| head -10
Warning: date(): It is not safe to rely on the system's timezone settings.
You are *required* to use the date.timezone setting or the
date_default_timezone_set() function. In case you used any of those methods
and you are still getting this warning, you most likely misspelled the
timezone identifier. We selected 'America/New_York' for 'EDT/-4.0/DST'
instead in /rss/slackbuilds.php on line 3