rich and tomwid, can you please see if you encounter any trouble (libusb, echo -e) building the latest official dfu-util code at git.openezx.org/dfu-util.git ? They plan a dfu-util 0.2 release next week, so it would be good to report MacOSX issues and have them fixed before the release.
I guess most trouble you had building my dfuse branch would be the same in the upstream code, so it would be good to have it fixed there for everybody.