Hi, I follow the step , http://www.friendlyarm.net/forum/topic/2289 ,and installed libusb-1.0.8 successfully. the error of libusb.h: No such file or directory disappeared, but usb.h the compiler message is: allh.h:36:17: error: usb.h: No such file or directory the application source is from: http://www.jollen.org/blog/2008/01/libusb_hello_world.html can someone help, thanks