Modules/Platform/kFreeBSD.cmake - third_party/github.com/Kitware/CMake - Git at Google

 # kFreeBSD looks just like Linux.
 include(Platform/Linux)
 unset(LINUX)

 set(CMAKE_LIBRARY_ARCHITECTURE_REGEX "[a-z0-9_]+(-[a-z0-9_]+)?-kfreebsd-gnu[a-z0-9_]*")
	# kFreeBSD looks just like Linux.
	include(Platform/Linux)
	unset(LINUX)

	set(CMAKE_LIBRARY_ARCHITECTURE_REGEX "[a-z0-9_]+(-[a-z0-9_]+)?-kfreebsd-gnu[a-z0-9_]*")