these 20 derivations will be built:
  /nix/store/ds081jngdn80hxm0vmhxnq3dm5sxw4yl-unit-postgresql.service.drv
  /nix/store/0dd4vzcdvw9mc0bqqcvb9dsqqqlnpajp-system-units.drv
  /nix/store/lfqb3irwmdb5fms9fi5di9x13m400wqn-unit-postgresql.service.drv
  /nix/store/cgcp25krdx5drjplqvndkwvycra78nwv-system-units.drv
  /nix/store/p8z074llppkf0sl5xwslhnmn6dxmmfky-etc.drv
  /nix/store/7jh1y6ahk42bf6fqyi3kza4nvv86z7dg-activate.drv
  /nix/store/xjvz9nzx0v3by4skr8cbi7zhl3bhibsh-etc.drv
  /nix/store/x0327d3xb7bhl491pp99vp2kwipwb87s-activate.drv
  /nix/store/wp4rw49ahwkfypi8qlkdb4cz3d1dj7kv-nixos-system-server-test.drv
  /nix/store/9sfhydla15r18aa5pq3n2gja93dxw1fb-unit-postgresql.service.drv
  /nix/store/vcl78lsk18ri1vya3frc9q3hx8h9kjyp-system-units.drv
  /nix/store/fcsfhfb3xbqymbj7fcrs2pdyv4adsmv2-etc.drv
  /nix/store/jslb7325kcdxfb895am3lwx7dpp84s8n-activate.drv
  /nix/store/znz3kq7j6iaac7drfi3yynpjhp31dlcb-nixos-system-server-test.drv
  /nix/store/i6hik4dcbmifkqg8alsbx3mmb2m65ya6-nixos-system-server-test.drv
  /nix/store/q7x8m7wzqki7hcvx4jgxm82c6mmwik6d-closure-info.drv
  /nix/store/q5yjirxliv2524vdsy4rkn9yb96h6f1f-run-nixos-vm.drv
  /nix/store/8yqm8z228j6q6fqj7rkf02v7hdk7mlih-nixos-vm.drv
  /nix/store/yb9kg95xzmb9ib57dla74jwafr8i3kwa-nixos-test-driver-pgroonga.drv
  /nix/store/lslq9zgq0zbvpviwdxca92w6a9n8922q-vm-test-run-pgroonga.drv