these 20 derivations will be built:
  /nix/store/63lnmzf9apvph2ymc8lydakn0d8b9nb3-unit-postgresql.service.drv
  /nix/store/k8lwd1ik3r76cbhj59zn4xqb3svjirnj-system-units.drv
  /nix/store/125z40wn2rzl88sccdj9nb61vpqc9p0v-etc.drv
  /nix/store/j0zyin60dd8lsx2y9246icypbb5f2571-activate.drv
  /nix/store/2yx3zga0fn1zdfnfy74bvm7b0gl6vwnf-unit-postgresql.service.drv
  /nix/store/gxy429js0rx3jcd9z69yd6rbna58856d-system-units.drv
  /nix/store/ycxmy8q6jfvadqsi1hwvy3bg3acqsrwz-etc.drv
  /nix/store/2w7x3vssd3vkgp6kspdrdqqd0lmndsln-activate.drv
  /nix/store/p8lsfbia8223ihwmgd7c1mx2frx96ywy-nixos-system-server-test.drv
  /nix/store/br51dbf54gwis7r0wmj8q87ib8y16gcn-unit-postgresql.service.drv
  /nix/store/l5ww3pawk84l5lihb03wcybyghbrq4qw-system-units.drv
  /nix/store/zbd1dm92rangc43brzdiwhpd03x12z8v-etc.drv
  /nix/store/4cg72cnaz8b4z8jlbchvph0ivl34a46w-activate.drv
  /nix/store/wsx9zhr7a8j9lgdqzc5fzcw0j7xglc4i-nixos-system-server-test.drv
  /nix/store/rl1l8c1vfdszl8fwk6860ryplaq8zljw-nixos-system-server-test.drv
  /nix/store/hb6513hwc8dyhdxiww80xw1x4d040bfi-closure-info.drv
  /nix/store/61pfk5kf39nixi6apls7nwmynr7rg2x0-run-nixos-vm.drv
  /nix/store/mz0s82ibggnbpkcb059xdd74cx85rk7i-nixos-vm.drv
  /nix/store/i2yb1gxakh7yrnxagv9pvp37nwn321sg-nixos-test-driver-http.drv
  /nix/store/1b5vyghc0dqmybm70vnwqw7566lci096-vm-test-run-http.drv