Steps taken to install the patch.
[1] Download the patch file "rfc3542.patch" into a directory (/root for example)
[2] Go to your cvs directory (/DragonFly/DragonFly-DEVELOPMENT/src for example)
$ cd /DragonFly/DragonFly-DEVELOPMENT/src
[3] Install the patch.
$ patch -p0 < /root/rfc3542.patch
[4] Rebuild the world and the kernel
[5] Reinstall the world and the kernel


For more information about the project please see below document:
The Design and implementation of RFC3542 on DragonflyBSD.pdf