If you have a system older than 2.4, pkg_radd uses an old path to find files. Applying the changes here:
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/3d62c9e33361b5901e858332066162cc93afc27b will make it work with the current layout, and it means I can get rid of the old top level links, which I'll do momentarily. (I figure this only affects a few people running older systems, who may have changed the path already anyway...)