Security Run Output Setuid Differences

[PeterPluta]

I did a lot of port hacking yesterday. By that I mean screwing up and redoing
lots of things. Anyway, I woke up today to find this email in my inbox. 

Checking setuid files and devices:

mail.placidpublishing.net setuid diffs:
--- /var/log/setuid.today	Fri May 18 03:02:47 2007
+++ /tmp/security.207RUJmY	Mon May 21 03:02:30 2007
@@ -3,7 +3,6 @@
 70745 -r-sr-xr-x  1 root  wheel     21792 Jul 30 16:19:55 2006 /sbin/ping
 70746 -r-sr-xr-x  1 root  wheel     28660 Jul 30 16:19:55 2006 /sbin/ping6
 70721 -r-sr-x---  1 root  operator  10148 Jul 30 16:19:56 2006
/sbin/shutdown
-165583 -rws--x--x  1 root  wheel     268432 Apr 14 14:05:10 2007
/usr/X11R6/bin/xterm
 377219 -r-sr-xr-x  6 root  wheel     17532 Jul 30 16:19:56 2006
/usr/bin/chfn
 377219 -r-sr-xr-x  6 root  wheel     17532 Jul 30 16:19:56 2006
/usr/bin/chpass
 377219 -r-sr-xr-x  6 root  wheel     17532 Jul 30 16:19:56 2006
/usr/bin/chsh
@@ -19,9 +18,9 @@
 377219 -r-sr-xr-x  6 root  wheel     17532 Jul 30 16:19:56 2006
/usr/bin/ypchpass
 377219 -r-sr-xr-x  6 root  wheel     17532 Jul 30 16:19:56 2006
/usr/bin/ypchsh
 377398 -r-sr-xr-x  2 root  wheel      5828 Jul 30 16:19:57 2006
/usr/bin/yppasswd
-72750 -rwsr-xr-x  1 root  wheel     285580 Nov  2 01:21:29 2006
/usr/local/bin/screen
-71569 -rwxr-sr-x  1 root  kmem      112708 Feb  3 17:17:26 2007
/usr/local/sbin/lsof
-71923 -rwxr-sr-x  1 root  maildrop  142559 May 17 14:41:47 2007
/usr/local/sbin/postdrop
-71924 -rwxr-sr-x  1 root  maildrop  152477 May 17 14:41:47 2007
/usr/local/sbin/postqueue
+71112 -rwsr-xr-x  1 root  wheel     285580 May 20 18:23:48 2007
/usr/local/bin/screen
+70971 -rwxr-sr-x  1 root  kmem      112708 May 20 18:23:03 2007
/usr/local/sbin/lsof
+73170 -rwxr-sr-x  1 root  maildrop  142559 May 17 14:41:47 2007
/usr/local/sbin/postdrop
+73204 -rwxr-sr-x  1 root  maildrop  152477 May 17 14:41:47 2007
/usr/local/sbin/postqueue
 923168 -rwxr-sr-x  1 root  smmsp       5236 Jul 30 16:20:07 2006
/usr/sbin/mailwrapper
 923264 -r-sr-x---  1 root  network    11636 Jul 30 16:20:07 2006
/usr/sbin/sliplogin


What exactly does this all mean? Specifically the @@ -19,9 +18,9 @@ stuff.
Also, why did this all of a sudden appear?
-- 
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