At the moment GuixSD doesn't yet work on ARM. Not much is missing and you can use Guix as a package manager on top of some other variant of the GNU system, but

At the moment GuixSD doesn't yet work on ARM. Not much is missing and you can use Guix as a package manager on top of some other variant of the GNU system, but GuixSD on ARM is not quite ready yet. Give it a couple more weeks.