If you happen to be using DragonFly from a network location that only allows http/https as outbound traffic, you won’t be able to update /usr/src using defaults.  /usr/Makefile pulls DragonFly source using a git:// URL.

The fix is to use the read-only Github mirror.  You can set origin manually or just change GITHOST in /usr/Makefile (or GITURL_SRC if you are on DragonFly-master) to “https://github.com/DragonFlyBSD/DragonFlyBSD”.

(Guess what I did today?  Updated to note it’s different on -master.  Thanks tuxillo for reminding me of this whole thing.)