FWIW, there should be no reason to build crossystem as part of coreboot's compile-time utilities at all. crossystem is a helper meant to run on the target device (the one that uses vboot-enabled firmware), it doesn't make any sense to have it on the build machine. We should fix the Makefiles so that they don't even pull this in, so that coreboot can also be built on architectures that crossystem doesn't support at all (e.g. SPARC or whatever). futility itself just does some crypto stuff and should have no architecture-specific components.