Naoto HIEDA
Download and install drivers from Phidgets Support
In Build Settings -> Search Paths -> Header Search Paths, add /Library/Frameworks/Phidget21.framework/Headers
In General -> Linked Frameworks and Libraries, add /Library/Frameworks/Phidget21.framework
WINDOWS - Visual Studio 2012
Project Properties -> Configuration Properties -> Linker -> Input -> Additional Dependencies -> Edit -> Add C:\Program Files\Phidgets\x86\phidget21.lib