dev-libs/libusb and sys-apps/usbutils create /usr/lib/libusb.so and /usr/include/usb.h, but the library from usbutils is very incomplete from libusb one, but as usbutils is required (by hotplug at least), gphoto (and others) which need libusb, can't work anymore. I did not try if lsusb works with libusb.
yeah, i just noticed this problem too while debugging problems with usb support with libgphoto2. i wonder if the authors are aware of this.
i noticed that redhat doesn't distribute /usr/lib/libusb* for usbutils to avoid the conflict. it seems also that lsusb and usbmodules does not use libusb.so dynamically (at least not according to ldd). so i think we should get rid of /usr/lib/libusb.* for usbutils for consistancy. i don't see the advantage of having both. the only other thing apart from hotplug that depends on usbutils is usbd. i don't know if that uses libusb.so or not though.
i've gone ahead and made a new revision of ubsutils that has the libusb stuff removed. also a new revision of dev-libs/libusb that is exactly the same, but will force people to merge libusb again to make sure those files belong to libusb
