Package ('xz', '5.0.4', sources = [
		'http://tukaani.org/xz/xz-%{version}.tar.bz2'
	])

Package ('xz', '5.2.1', sources = [
		'http://tukaani.org/xz/xz-%{version}.tar.bz2'],
		override_properties = { 'build_dependency' : True }
	)

Update xz to 5.2.1