these 20 derivations will be built:
  /nix/store/z2w3p0343x3wvg36ch0cd466a50s6gvr-unit-postgresql.service.drv
  /nix/store/ybdg8x69qlrdl771fm4124fydi7b3q4v-system-units.drv
  /nix/store/byhp1fjr9f2d0yjfak1g6gfgm3jrsvy4-etc.drv
  /nix/store/f0brrssy946waqzs57r3jffflgzj03g4-activate.drv
  /nix/store/2wl6ffdmcv85ysvkhxr090m24sirywx8-nixos-system-server-test.drv
  /nix/store/d6hg8c59a73k0b1xclc1ak22bf2753ad-unit-postgresql.service.drv
  /nix/store/kbwsz8gq2wp3zskfisiwglk24pvcac43-system-units.drv
  /nix/store/8l3f8y3cbl1arxjd2sgjgvi9yv3jvs96-etc.drv
  /nix/store/iigfiqlag277lblsfwv1a6mkax7khsjc-activate.drv
  /nix/store/40c2vzx610jr02710i3988ivs4qnlkp2-nixos-system-server-test.drv
  /nix/store/xayn5p9mg8246dglpy46kalnf7v3n00q-unit-postgresql.service.drv
  /nix/store/2i87bj3ny7pf7vjr27w745jqmr1drb0r-system-units.drv
  /nix/store/prsm7bc2cgp67r7rj1gs7nm66vav38hq-etc.drv
  /nix/store/8w6n533js2g5qwixwdbr3fj6ans3cylk-activate.drv
  /nix/store/gja2674pzpib661xrakpvlvr4i2vigz8-nixos-system-server-test.drv
  /nix/store/66s3zx5hjwgb3d4245i1vys65src14lq-closure-info.drv
  /nix/store/wlhkha1s7qrizj2ii91bqk66phzyyk8r-run-nixos-vm.drv
  /nix/store/a89zrribr129g7h4s6grqrv897prksls-nixos-vm.drv
  /nix/store/cw718pbs21hlsn4zxn6wh48nrjxwlx98-nixos-test-driver-pgroonga.drv
  /nix/store/03xw91ii21f73dxzpzznnznra3jjax41-vm-test-run-pgroonga.drv