Upgrading DragonFly BSD

I have two DragonFly BSD boxes that I want to upgrade to the latest rev. At the moment, they're running:

$ uname -a

DragonFly screw.lodden.com 2.10-RELEASE DragonFly v2.10.1.1.gf7ba0-RELEASE #1: Mon Apr 25 19:48:10 UTC 2011 root@pkgbox32.dragonflybsd.org:/usr/obj/usr/src/sys/GENERIC i386

Unlike most other BSDs, DragonFly uses git for source code management. DragonFly provides make wrappers to git updates, however. If you don't have the source code already installed, get it with:

$ cd /usr
...