these 20 derivations will be built:
  /nix/store/8bjs0kxvkqjhlc9b1lcwhrb3dklz9m0h-unit-postgresql.service.drv
  /nix/store/lh3nkvfnlrydcqzw17hj7yhvnyqjqawj-system-units.drv
  /nix/store/c32haf7r02h1qgvgpfysl1v6wf769v5y-etc.drv
  /nix/store/pijn13js9a1gpsrwl7b5p3kdganv4gji-activate.drv
  /nix/store/1287lzijgp4pmrrccc4j34xp7wz5csn3-nixos-system-server-test.drv
  /nix/store/x6ps95wmgwwc9azbk8ip8nwmznjsi74b-unit-postgresql.service.drv
  /nix/store/b5lhdy1bkpvmsvjc5wgm94gby1zb066a-system-units.drv
  /nix/store/kw68jfmqs548c23gi1pwamcmdk97hh18-unit-postgresql.service.drv
  /nix/store/firy29qy5wja38nlw1kvvrg3yxm2l9m4-system-units.drv
  /nix/store/xdcpapa8s5rxsvicnijbkkaxsjr47mw1-etc.drv
  /nix/store/gl7xmh0w21f95vlnxaflbkp7c9r8ad99-activate.drv
  /nix/store/hp9adzfw108pi87d2cppwc2q3r9hh53y-nixos-system-server-test.drv
  /nix/store/hrg8a1chf3hkaiz1nsf0vg3dgha2lqzq-etc.drv
  /nix/store/sfvfl7k4jsy3kj1izgnjgmvzbys5j6hy-activate.drv
  /nix/store/lxymflrg71aiyimqpkygni9x276ig8li-nixos-system-server-test.drv
  /nix/store/rdhsd079vkjjz63wnvpqa5bq499qyqyl-closure-info.drv
  /nix/store/hsk3x1m5fic6alz9ag8c7sdpx3mr1qah-run-nixos-vm.drv
  /nix/store/jw9z0yygplf69ims80x9j7ikyrma4fws-nixos-vm.drv
  /nix/store/q1z0yr7hypb1i3arpgnr9d5brz24x99f-nixos-test-driver-pgroonga.drv
  /nix/store/ds64wnyikrlawjwbc5ifk3n94jjaxv2r-vm-test-run-pgroonga.drv