these 20 derivations will be built:
  /nix/store/0awa74m3rbxhd82dkmyk476b72bbvcmb-unit-postgresql.service.drv
  /nix/store/7jp41y2wdyvrz9bpis4pp5s58a7ry8vx-system-units.drv
  /nix/store/ir6h6n9mrgc560fkqbv94q7v4xcvnb1w-etc.drv
  /nix/store/qbn248982bpzf4xzqk6l0zlg5yd8mgp8-activate.drv
  /nix/store/7ydi3cm9r3jx0kv568f4pimai5cqmri2-nixos-system-server-test.drv
  /nix/store/f0wcg7i6ys2gkbqgkrzdnz36i5aldi0b-unit-postgresql.service.drv
  /nix/store/7xgpp5mh8i0z1iirihsi3by151zqqvl8-system-units.drv
  /nix/store/zc0m64qdzrdhqmmsjnv6fsfcvgj7qjyr-etc.drv
  /nix/store/8cv0mwyhc2v6lnmm26rn5kbdxv4x2d8r-activate.drv
  /nix/store/jih9jbr22zj0vnz90fhmprf4ljqjfphs-unit-postgresql.service.drv
  /nix/store/4irgr8kd40gxg0dj8031zc4xfsvd7q3l-system-units.drv
  /nix/store/k9d7w4h7jbr5n4x7vshdgd3f0wbhrxpk-etc.drv
  /nix/store/jsrkj1sqmafrxsl5wsmfzcw6hbb82i2y-activate.drv
  /nix/store/wr4dl1v7adfkv1xzsa3a62b0x90fb2sp-nixos-system-server-test.drv
  /nix/store/l1zcwmbzk84z4b3qs7lymjragm7vn7vr-nixos-system-server-test.drv
  /nix/store/7yinn19kk6m6pggdb89arg4s258382wm-closure-info.drv
  /nix/store/p96837in8bfk3nn4xiw1gdccqjf6q10g-run-nixos-vm.drv
  /nix/store/r7k0zmya35m2dc65hp4b9q4bwxjq1rc0-nixos-vm.drv
  /nix/store/dwql2gwf6g6yimkjyh6hv73affhpamv6-nixos-test-driver-pgroonga.drv
  /nix/store/1114n6fzbwq2p3lg0666ms6a0j0hiy9j-vm-test-run-pgroonga.drv