this derivation will be built:
  /nix/store/fi1af98n48jcp1892k0vm4k4z4394620-lib-tests.drv
fi1af98n48jcp1892k0vm4k4z4394620-lib-tests.drv: mac02: not scheduled here: fi1af98n48jcp1892k0vm4k4z4394620-lib-tests.drv, asking the scheduler again