Joerg Sonnenberger wrote me to describe the preferred bug reporting path for pkgsrc issues on DragonFly:
1: Mail Joerg Sonnenberger or users@dragonflybsd.org
2: Mail DragonFly developers known to work on pkgsrc
3: send-pr, on the NetBSD site. (The first page I found for that looks to be focused on NetBSD…)
4: Mail to the tech-pkg@netbsd.org mailing list.
Don’t let the NetBSD project part disturb you, category “pkg” is for all pkgsrc related bugs.