these 20 derivations will be built:
  /nix/store/02kgbzksbsq0m7dwb0njs9bl73y346cd-unit-postgresql.service.drv
  /nix/store/7a1jmpj2plymdbrv69fj7asmsh1spr6c-unit-postgresql.service.drv
  /nix/store/pj54xljkvcidvfx5dk8vjq4n9lwvgml9-system-units.drv
  /nix/store/8i36x9i025wh7v8bzf92b6jy2hzjzlqa-etc.drv
  /nix/store/4s2nz384dng63kxi2cf3vqs01k63rgcb-activate.drv
  /nix/store/cmar8d6w7hm6kvkdjmmx6xagdinlrvd2-nixos-system-server-test.drv
  /nix/store/yvcvykvsh7rajb1bgq7cd9ipbwxfbr1c-unit-postgresql.service.drv
  /nix/store/yvgyqz791c906366fi116jj64ncqkiyc-system-units.drv
  /nix/store/jc82dqcy38l4slyb2js0qm90hr21n8p3-etc.drv
  /nix/store/bb4gbarqnjhxsp54vxv82fikldgkygz4-activate.drv
  /nix/store/fcd6wajv1ahdvzlpw6zw5dpg8sfi9py6-nixos-system-server-test.drv
  /nix/store/h72p3is4mqh1m8hj7xdl50x247i4pc62-system-units.drv
  /nix/store/mq188dg9l77b5hgqdd4b4k6342f8y2xb-etc.drv
  /nix/store/vznzn9k9c6cw30sm6a37mwr9fhvayb9d-activate.drv
  /nix/store/im3xs4pprzknmy1dikx8jhf0j6ag8y8j-nixos-system-server-test.drv
  /nix/store/c1xq6r3gavhc132ns2jcrc8slk6k04wq-closure-info.drv
  /nix/store/7nmixwidhj0kgvsida0f91cxf0hz0nb1-run-nixos-vm.drv
  /nix/store/jq4fb6x8k5vsp1dvigxg96iaj7v89hl6-nixos-vm.drv
  /nix/store/18fj5p562pwvmjcsl1qlplgh556wsvk8-nixos-test-driver-pgroonga.drv
  /nix/store/5xprd5zyi6gzy4iyp7ckj19b6bzs5s7m-vm-test-run-pgroonga.drv