It's still a very untested thing, so there's now howto. I've updated the OP with a slightly modified version which has the proper #include syntax. Might fix it for you, I'm not sure, though. Are /usr/include/libusb-1.0/libusb.h and /usr/lib/libusb-1.0.so present?
And did you really read the README? It at least tells you about a first step you can do. Oh, and please make sure you have understood the license, at the begin of the source file :-P