these 20 derivations will be built:
  /nix/store/q8wx648d3l9yi0l3skbpx1j52z00d4bd-unit-postgresql.service.drv
  /nix/store/9qy2r7iqqvvm9r48qw57d17jm9fbr0v7-system-units.drv
  /nix/store/114w77a59lyqn9ga4zzmrrb205xfyqsb-etc.drv
  /nix/store/mpaqfkb8d0y5bsp07xb02n5ahg6j9dpi-activate.drv
  /nix/store/02xd6pxc8p4288a8d2fnd418chdb34ji-nixos-system-server-test.drv
  /nix/store/yq8zcazpxx536g33gmhf9g3qkxwxa527-unit-postgresql.service.drv
  /nix/store/fp9fcwipjnh4cjcxxfl5pqxv4d83lkbc-system-units.drv
  /nix/store/qpmbh83yribawf39jc2ply1bms1zy9zz-etc.drv
  /nix/store/n61ia8j4av2h7fzfarz7hm1685gr4w4m-activate.drv
  /nix/store/lb6pwwqim5sq9cb3v3mdb6vx2hic25hh-nixos-system-server-test.drv
  /nix/store/a1r8nfh21qrrd0026b9k7zngk629jir9-unit-postgresql.service.drv
  /nix/store/l3b2gc9rs8h2vwk8sf3zm09j76ailpgr-system-units.drv
  /nix/store/m681fbwbn2bh387034wj0rqddrg1dy7v-etc.drv
  /nix/store/zbffz7202jr1yy8v5z1drawk9svgygqi-activate.drv
  /nix/store/v2l9mj6jj9bw6b6a5kiz5af7bsymhipy-nixos-system-server-test.drv
  /nix/store/i41jfgqym7351ly008m2s6v8asxkpa83-closure-info.drv
  /nix/store/2nz310v821hr68ln450wg8dzmqbf2j34-run-nixos-vm.drv
  /nix/store/9w4fqcq9kcpdmik3vqf2wi7x0kywj7pm-nixos-vm.drv
  /nix/store/sk1bsd5cc71a73kq5ckfxq0lxlnv53hl-nixos-test-driver-http.drv
  /nix/store/i6gi3d0d956f9hla5xgl2frwn56kisza-vm-test-run-http.drv