gssproxy is only used in nfsutils as a dependency, after 0.8 0.9 wouldn't build without systemd, so nfsutils is built without it instead.  When 9.1 was introduced it would again build without systemd, so we built it, but still not used by nfsutils.  If you are building your own make the choice yourself.  Void does not use gssproxy on nfsutils, gssproxy does not exist in many systemd-less distros.
