(2015-05-12)
...or, I really shouldn't have to keep trying to figure this out.
Sample Session
[rancid@sylog ~]$ cd ~rancid/local/configs
[rancid@sylog configs]$ cvs -d ~rancid/CVS status wheel
===================================================================
File: wheel Status: Up-to-date Working revision: 1.19 Tue May 12 18:41:12 2015
Repository revision: 1.19 /var/rancid//CVS/local/configs/wheel,v
Sticky Tag: (none)
Sticky Date: (none)
Sticky Options: -ko[rancid@sylog configs]$ cvs -d ~rancid/CVS diff -r 1.19 -r 1.18 wheel
[...]