Hey Graeme, I understand why there's a private libusb1 fork in the tarball, due to years of bad maintainership in the libusb project. A new project libusbx ( http://libusbx.org/ )has been forked which promises to be easier to contribute to with a few of the prickly people left out of the new maintaining roles. Is there any chance you could perhaps look into forwarding the patches against libusb1 to the new people? It would make my life as a distributor of Argyllcms much much easier. Thanks, Richard.