Packages describing “libusb” as local USE flag

Package“libusb” Flag Description
media-tv/kodiUse virtual/libusb for usb device hotplug support. This flag should only be enabled if you're running a non-Linux kernel or you don't want to use udev.
net-misc/bfgminerUse libusb
net-wireless/kismetSupport libusb based capture sources such as mousejack, cc2540(ble), and nrf51822(ble)
sys-apps/pcsc-liteUse dev-libs/libusb detection to hotplug new smartcard readers. This flag should only be enabled if you're running a non-Linux kernel or you don't want to use udev.

All packages providing a “libusb” USE flag (3)