these 20 derivations will be built:
  /nix/store/0p3nd446ch7ibyqa6vn3a413kyagv9by-unit-postgresql.service.drv
  /nix/store/ca8sdyjzxq3a7m4jcw81kfr0sc7grfav-unit-postgresql.service.drv
  /nix/store/2d88qsl85l5qnjkmb50jp3qkgghspph8-system-units.drv
  /nix/store/pdfxiijxr69linakcza4krpi5ar0981n-unit-postgresql.service.drv
  /nix/store/ypcb6a39fmvwp5jnpfrd7x5ls4gyjxdl-system-units.drv
  /nix/store/8ja2vjd4y5i0p623d15qrhff9n3rh40j-etc.drv
  /nix/store/393n425rx1m2giazq3l051bg4n86lais-activate.drv
  /nix/store/585bbs73icvrzpc8sb8bjbrgw36skx78-etc.drv
  /nix/store/w70z1x4xr3qqk86zsafjg0mqz7cyf98l-activate.drv
  /nix/store/gh6iqc7nhcf5sy9la8xir43yglvbv8vf-nixos-system-server-test.drv
  /nix/store/kpwz1nsggzxb1viwcv5py659ps0y2dws-system-units.drv
  /nix/store/jhsmzzhd4kmdvk2hh077ffhasqir95k8-etc.drv
  /nix/store/wh4y90m7fwjzzyc5l308szx9g3nmgxwv-activate.drv
  /nix/store/xzggwcamj6kszlvzgdyvsywynadv4jaf-nixos-system-server-test.drv
  /nix/store/8l2m7k3f94l9d7ryxrxc3zvi0b3vr07x-nixos-system-server-test.drv
  /nix/store/bi7maw458z19vav15qyi336ryvcyxkin-closure-info.drv
  /nix/store/n8wiy36g5z2p9kv4wvaklzv7wsxplcc6-run-nixos-vm.drv
  /nix/store/gc56c2y7qwy0k2wi3dm19j2gls5adfnq-nixos-vm.drv
  /nix/store/6bds8l85jcnqgg6hpp1yk4ws1mxkxmw6-nixos-test-driver-pgroonga.drv
  /nix/store/4izpskmqrj5lgzjqpdfgsm19f7nd1rzb-vm-test-run-pgroonga.drv