these 19 derivations will be built:
  /nix/store/dm7hwf6yznpyl0qa1d4gd0qm4afsyng8-unit-postgresql.service.drv
  /nix/store/sfkg4r4s7nckzj2gcpbzgv4zvmj109gr-system-units.drv
  /nix/store/cwzzdpcwns1iw72yg5isr413x86a0s3n-etc.drv
  /nix/store/y4qd5fdvvby0b15wmxfxh0bfsccvr506-activate.drv
  /nix/store/0hyrgx0274y7yz6mr978ql94gas7xw2w-nixos-system-server-test.drv
  /nix/store/1nfc4ci33sqf6ww55g5dna3v12l75b9q-unit-postgresql.service.drv
  /nix/store/v7cjc39p29b8h3n9w13jsy7xg5yz1v2k-system-units.drv
  /nix/store/nrxr9kj1lhah3yvxj400mkyfpvfzhq9y-etc.drv
  /nix/store/dwi1f8hw7k6jx2wbjfm0aqlgqpcdkcjh-nixos-system-server-test.drv
  /nix/store/n86vlxjvjn2rpr13k66531nclskxwvsa-unit-postgresql.service.drv
  /nix/store/dm6w3cqhidyzpi0wjdf6fzgkdr136x02-system-units.drv
  /nix/store/r59x0wcaplbzswjf89j3lb2178mibkwi-etc.drv
  /nix/store/jvgzl1blwv7jhi8irfqiwc1mwn5i72r6-activate.drv
  /nix/store/hpvp5fbsyw2mq3w5nhf4v91s2p73dpzm-nixos-system-server-test.drv
  /nix/store/0riq229bmppzyvmaa9m4s2iyaiafzz9g-closure-info.drv
  /nix/store/7n0l9db2yx9ghschsz5a7fjh3sanrk7a-run-nixos-vm.drv
  /nix/store/qpfndnb1bawsq5bj72l4bjcf24q814gd-nixos-vm.drv
  /nix/store/4vklpidn9jy7gzm2yp50s5lcz1ayqnhx-nixos-test-driver-pgroonga.drv
  /nix/store/2s0kind58zk8c2xx32addm6m9wcsasmh-vm-test-run-pgroonga.drv
these 4 paths will be fetched (13.9 KiB download, 135.5 KiB unpacked):
  /nix/store/kd7nf8a1skz31p2zk498m4kv1870adid-activate
  /nix/store/6bk27rwdj0inn7yv3m85j4ip8g92vcwm-etc
  /nix/store/a13964civm40bg4nxhq4gdv069siv8hm-system-units
  /nix/store/wlpsbazv2aancivaa7pbcjmxpz5cyxd4-unit-postgresql.service