these 20 derivations will be built:
  /nix/store/0b6yafmw4fknrpywiigcqr794dw56kjr-unit-postgresql.service.drv
  /nix/store/yagakr94jg0jybam7d28waqmhw6q3f2f-system-units.drv
  /nix/store/k33vrjax2p6fc9fzwk2as628698fv0zm-etc.drv
  /nix/store/gxqn6sqv2ipd4xqwnc3yva73przychjz-activate.drv
  /nix/store/amg5a62h159vclfjlrx3rvk5wfg8p82n-nixos-system-server-test.drv
  /nix/store/3jkk8wpi4p84njw0vilwjxvvdihp39yn-unit-postgresql.service.drv
  /nix/store/qf5063y0rmjxqh5h2yplvh04dswcxlh7-system-units.drv
  /nix/store/fnpckcszrm11y3l8pc3l6hx5j9znfasn-etc.drv
  /nix/store/cq4zkhvrbxr2szm1dildnhzpl3m0c3y0-activate.drv
  /nix/store/hfx2dk9zz7r2cs75jwrzgfha509rqc67-unit-postgresql.service.drv
  /nix/store/i8l501qk0n786xc18c6mq6m5q414wngm-system-units.drv
  /nix/store/8w6lfqmk8cmhm55866v3pxrww9phr4sy-etc.drv
  /nix/store/b6f1xrc4vnb13xb7y34x811i9v3dm7kw-activate.drv
  /nix/store/yk96anqj80anv4lj1yrz1ffraq9s2zfr-nixos-system-server-test.drv
  /nix/store/wv984gfib7v0jmfw8kz0s6ja475k8p3q-nixos-system-server-test.drv
  /nix/store/d6v8xxhxg6k8542w5f6vczpp7ll1kjbx-closure-info.drv
  /nix/store/3h55nhnmbr7fbnph87fg13msw6kxa8jr-run-nixos-vm.drv
  /nix/store/xg76ixs079n8ifkbjz9a6c0wbdh21cdv-nixos-vm.drv
  /nix/store/y2k8flamq3kgl678zg2s7iim8amwa5x5-nixos-test-driver-http.drv
  /nix/store/syvahlkdp76dga30i8490rh319nawl0l-vm-test-run-http.drv