these 20 derivations will be built:
  /nix/store/pj3hjrklfqrp7k4v4cr0f8mxn613lrqg-unit-postgresql.service.drv
  /nix/store/6vnw4z1dwzxyk2hh6mamcdnvy42lvqfs-system-units.drv
  /nix/store/1sdd1dpgmvdb5g3in4dbv5mpk4g724fy-etc.drv
  /nix/store/2bk46rfs4lfxc07527rym59xb4qaq1ji-unit-postgresql.service.drv
  /nix/store/b3phyzx7543xirb1pckjzm8xhdhp7y5m-system-units.drv
  /nix/store/5kk8ivylbx0ai39gppkxgpgh80s3ans1-etc.drv
  /nix/store/4ilvlr2k6vng24h29nl8yrmbjn4fdkw4-activate.drv
  /nix/store/2csa31xyild9xfjr108h41a03r03g8jy-nixos-system-server-test.drv
  /nix/store/i8r40q3mc8yp4llz4s7y2frd1h7z817q-activate.drv
  /nix/store/kyvfnw7m4m0dpbf5sbcxbzfkkrm8nga9-unit-postgresql.service.drv
  /nix/store/wl8dvkd0dyfybhz9hb2x406kdgqdx4xg-system-units.drv
  /nix/store/vsd1xxigk9bdy2qz7wlk1c0yh5l6d4z0-etc.drv
  /nix/store/xfpnngqnjqk8ag980pd9nwi3nq5d5mrn-activate.drv
  /nix/store/prl9a6vldb7wzk2gg0h3xyv5r80r72dy-nixos-system-server-test.drv
  /nix/store/bki03icviwcknfb3ds95j06plvd1smxy-nixos-system-server-test.drv
  /nix/store/5h8cd16z3jj2di07gizcgnmchqd1hf1d-closure-info.drv
  /nix/store/9ik55s757d738zjkfqysad0zyicqrwwz-run-nixos-vm.drv
  /nix/store/v49g742jbxjnvki9a521bf8miz42qaik-nixos-vm.drv
  /nix/store/4pgxfhxss31kiszi23xg6m9l5irlkf9w-nixos-test-driver-http.drv
  /nix/store/zb8r2b30ax2md9d0abj1fxh1k9hsm21w-vm-test-run-http.drv