these 20 derivations will be built:
  /nix/store/g1i8i14k4zvm0hr5k3y4g25amikmyab9-unit-postgresql.service.drv
  /nix/store/7dsl6c1ananm3szapdg75afr03cham4f-system-units.drv
  /nix/store/0ircdb7swr2y7pjn71hxsrbxsr2h3m3m-etc.drv
  /nix/store/64i3iyic674257i4hwgfb9jsf7hi079c-activate.drv
  /nix/store/1w2032mvizdq0nna2939nnjw1w3mn3pw-nixos-system-server-test.drv
  /nix/store/ml8m348r8l0n9frzg0qf3lqzxxcrzjam-unit-postgresql.service.drv
  /nix/store/zln8g92x7p7pajbik4zwh9ainqih127b-system-units.drv
  /nix/store/iql5n0i2k7spz2wcjzpaxvgrv4vhghva-etc.drv
  /nix/store/4ibp3fz2sgj85g7ysdpy98rhqcb7q5mv-activate.drv
  /nix/store/6kx2dd8rhnayix40phnk6mgp7jc8b8vj-nixos-system-server-test.drv
  /nix/store/g9nav5210jwzky3p332hi23lvqm6qdmp-unit-postgresql.service.drv
  /nix/store/ssz5xxp1jk6407dam9dmd9j1nfrd77b8-system-units.drv
  /nix/store/q0g340fzygq2h1nalf5s0qwqd1pkx0sy-etc.drv
  /nix/store/g34mh5zj8hpqq3n4gkrbrb1pap4qzl8p-activate.drv
  /nix/store/pbbfyh1yrgsfnc81gkzjhspc28gm1hik-nixos-system-server-test.drv
  /nix/store/dhb50rcbcbsgdc383rj2m145asik9fwz-closure-info.drv
  /nix/store/jdd0dp0xb8whlmhkvrky4w2s00cd5pw9-run-nixos-vm.drv
  /nix/store/x5c4ngz1zpmisf9hza9p8c76gn2vrgkb-nixos-vm.drv
  /nix/store/sbdnk83xvqa1906aldhnl71pqgn25jzk-nixos-test-driver-pgroonga.drv
  /nix/store/6ixz9rx37263rl9s33canjs44wdqz612-vm-test-run-pgroonga.drv