I don't know, I'm not counting them. And there is no doubt djbdns is better than BIND regarding security - it's just you can't use "8 years ago updating stuff was hard" as an argument, because it was not.
8 years ago I was using slackware as my main server distribution. Yes there is no "apt-get ..." in slackware even nowadays, but back then debian switched to aptitude at around 2005 ( sarge ) [1].
I remember around 2010 I reached uptime 3 years on one of the machines, with my good old patched slackware 10. Now imagine me switching to "apt-get ..." because of "easy security updates" for a tool that lived less than my uptime was.
Yes this is the time that I had to use exactly this argument, but against doing precisely that.
