To build bitcoind on DragonFly BSD (or NetBSD), you can now grab a copy of the git tree for bitcoin. From pkgsrc, you'll need to install Berkeley DB (db4); I used version 4.8, but 4.6 (also in pkgsrc, as db46) should work. You'll also need boost; I installed: boost-1.46.1, boost-libs-1.46.1, and boost-headers-1.46.

You'll need to make a few changes to makefile.unix before building:

To LIBS, I added -L/usr/pkg/lib ; replace with wherever your pkgsrc libraries are located. In LIBS, I also replaced -ldb_cxx with -ldb4_cxx.
To DEFS, I added -std=gnu++0x and -I/usr/pkg/include and -I/usr/pkg/include/db4 ; these changes don't really belong in DEFS, but its an easy place to add them.

After that, use GNU make with makefile.unix; bitcoind works and is able to download the blockchain and make transactions. This has been tested on DragonFly 2.10 / i386; the same steps should apply to NetBSD, but I haven't had a chance to try it.

Thanks!