It's called phidgets_native. gem install "phidgets_native" will install/compile the gem on your system, and you can view the source code here, if you're curious: https://github.com/brighton36/phidgets_native
There's no hokey ffi requirement, it's fast, and way more stable. Also I tested it out extensively on the raspberry pi without problems. Take a look and tell me what you all think!