these 20 derivations will be built:
  /nix/store/znnlkhdh24whrs1bsp67nl73xw4qvrni-unit-postgresql.service.drv
  /nix/store/bqnwigdw4kvcjwhk56m9hd9hspdi84vj-system-units.drv
  /nix/store/sfxpsrsflrd7cncq5anijscddbwjzi4d-etc.drv
  /nix/store/fx3avnmabwjvsd2cirxdnkr145i4laqn-activate.drv
  /nix/store/16zksywzi4pbqlrxvmkzkxh7blhplnkr-nixos-system-server-test.drv
  /nix/store/bf9wcz8i90rnzdcar2z0xc97jngxladr-unit-postgresql.service.drv
  /nix/store/g91z2yn9wj3xqhnqn02z94agjvy9id0j-system-units.drv
  /nix/store/jjpgpbblmclmi5wgpjqg8aqwyl9ncsln-etc.drv
  /nix/store/b582f7yh2y1bj9l8wc21nq1kf8y9cbdg-activate.drv
  /nix/store/9j1jcg5b2k1rxhy047xy1lcy8ys2m46z-unit-postgresql.service.drv
  /nix/store/xdh103h6y411kkzl13rjcw220aszzw3r-system-units.drv
  /nix/store/vsv552wazzxc9v7r81jk67asj8gych2w-etc.drv
  /nix/store/mwg8a0r02z2a4ahxd5n6723qs218agfb-activate.drv
  /nix/store/yr52q0bbn56lx7247387qybjjicxxhly-nixos-system-server-test.drv
  /nix/store/6fqx2aq54myd9hpsbfp138r6xadb1w8d-nixos-system-server-test.drv
  /nix/store/qwrg7a10bjxqdp2l7s7j03w5a4jpnynx-closure-info.drv
  /nix/store/yi459jira08kj70h34l171m3dl4viw1x-run-nixos-vm.drv
  /nix/store/7hs370kw24xbnsc4yrfvc4144ak8zppx-nixos-vm.drv
  /nix/store/pfg73fj373kidjacs9cy586akagv3xj2-nixos-test-driver-pgroonga.drv
  /nix/store/gd5za51h4bmrn13l8xij9mxli97dv737-vm-test-run-pgroonga.drv