Tests/RunCMake/find_package/RequiredVarOptional.cmake - external/github.com/Kitware/CMake - Git at Google

 set(CMAKE_FIND_REQUIRED ON)
 find_package(DoesNotExist-Optional OPTIONAL CompA CompB CompC)
 find_package(DoesNotExist)
 message(FATAL_ERROR "This error must not be reachable.")
	set(CMAKE_FIND_REQUIRED ON)
	find_package(DoesNotExist-Optional OPTIONAL CompA CompB CompC)
	find_package(DoesNotExist)
	message(FATAL_ERROR "This error must not be reachable.")