these 20 derivations will be built:
  /nix/store/l7vd2xl9andp313fijmvs0q8ap3clz55-unit-postgresql.service.drv
  /nix/store/96kyhh1myr7fpafnzvfdjdskw1nxma70-system-units.drv
  /nix/store/r5km4d2zj13y5h68i09xqbm5n0qxsb86-etc.drv
  /nix/store/1jq61fi2h776vf3i2yhywi78krc9lij5-activate.drv
  /nix/store/24k6rgps0fl3i1gb4jypxac3wgl1cr7g-unit-postgresql.service.drv
  /nix/store/z5rbdbinnakd9qz4kf6wmqhlvyvzfz0s-system-units.drv
  /nix/store/33bymi981npc1jxhjg2k40n5s2jgmlr0-etc.drv
  /nix/store/1m21mb9dqllhjpsbgg7j9lxlgp4sbbh4-activate.drv
  /nix/store/27sga3q900r523cv3mvhhsxg2nazw7cc-nixos-system-server-test.drv
  /nix/store/f1n31z6fl687r5jqq23ybk6d4px8ids3-unit-postgresql.service.drv
  /nix/store/4ldbjrzvx3nawibpf1c992x7bypyml08-system-units.drv
  /nix/store/kr90gvrsiyvnmjvldrqd171iw2ckpbzl-etc.drv
  /nix/store/fbsbz039jvb972jy7k86kywnwrcjdmyc-activate.drv
  /nix/store/hffz17sf1kqnx723j554svzd73hl54k3-nixos-system-server-test.drv
  /nix/store/vmzjiz13r7wx3pvmsaddgvi2zs7asr71-nixos-system-server-test.drv
  /nix/store/85xhjxcqv6dqljakpp6zprcs30sfs05x-closure-info.drv
  /nix/store/c2nx3757q2smng8bmkk6q6wb8bih2zg9-run-nixos-vm.drv
  /nix/store/pxq01h6kbsas39cg0fw6ww2m5wrd0p4y-nixos-vm.drv
  /nix/store/dn5i62id4pfikc4jzzllwvqi3iwic5sp-nixos-test-driver-http.drv
  /nix/store/fmasmxp90n462gmd7hapn8gpwc1hnj60-vm-test-run-http.drv