these 20 derivations will be built:
  /nix/store/1pkxdvypk1cf0n5chhzak0rj0nl9bxvw-unit-postgresql.service.drv
  /nix/store/7087vmb2jfvhg5f9dx54rg840aa55yvf-unit-postgresql.service.drv
  /nix/store/ykslcc36x7gv678igjblp126jp38kzxj-system-units.drv
  /nix/store/4ixhnjwgxws0cxsza8xk8pv3db7acp0j-etc.drv
  /nix/store/5zjcwrn1r1qc9l8kwns248jwvnf7i07y-system-units.drv
  /nix/store/d0c1wf5336xzpkz5rgdbkj10ggb4ld8d-etc.drv
  /nix/store/jyzzlw2ldqihzq88q8miw49hvi3q4kki-activate.drv
  /nix/store/g4573b7iwrwz026gqvdliama2pfk5djv-nixos-system-server-test.drv
  /nix/store/hxjyv7f0rcv3j7ygms52bzqx6mvj733f-unit-postgresql.service.drv
  /nix/store/lp2rz56ifd0dh9xjkn67caga02dq97my-system-units.drv
  /nix/store/iy9qwwyi5f1my7szzb8blwpgi5hvxyp0-etc.drv
  /nix/store/lljysggnz0kbjqmgr3cn02jcvangscb5-activate.drv
  /nix/store/ldbhrr44cis8mb9lylz2aw98bvc9qxwj-nixos-system-server-test.drv
  /nix/store/pbwwq8zmbcm0hns8q8xyilm0w876lam1-activate.drv
  /nix/store/yvva6kfqrl17wkgr19qh2gi2lk87havf-nixos-system-server-test.drv
  /nix/store/436k1l0gd197hnvvh001p393j1591iga-closure-info.drv
  /nix/store/xfm1zfzip3x33764crq454pi6nphi79c-run-nixos-vm.drv
  /nix/store/yim0fj0b3nmpjaxhchkh1r44l9nq5hmf-nixos-vm.drv
  /nix/store/3f0hmzcibmnhx2m2prw4rzh5m2fhqdg3-nixos-test-driver-pgroonga.drv
  /nix/store/psp3r65ir4wd41p76w8yf95vkyrp2v3j-vm-test-run-pgroonga.drv