cmake find_package(libusb) examples

FreeRDP/FreeRDP channels/rdpecam/client/v4l/CMakeLists.txt :22 

find_package(libusb-1.0 REQUIRED)

FreeRDP/FreeRDP channels/urbdrc/CMakeLists.txt :26 

find_package(libusb-1.0 REQUIRED)