these 20 derivations will be built:
  /nix/store/jxvi54mvzpac1yjxh4wiqy1fpm8pf1np-unit-postgresql.service.drv
  /nix/store/kb58ql5h9qf1y2x49iq96v3y8nwppgg5-system-units.drv
  /nix/store/ryhp66q3bk3xp7lj21mccsv6s0ij4s5l-etc.drv
  /nix/store/9g497g82d4s8d8xs9c5na3asr3jf7b8w-activate.drv
  /nix/store/947wxx4idk01c7bbgbl58jk9ay2503xm-unit-postgresql.service.drv
  /nix/store/qgvr0rs5m046h4s8nzc5a1snk3290wgd-system-units.drv
  /nix/store/iw16f284pdizf6l2gm07fw810zjzf6qk-etc.drv
  /nix/store/i213s41g5cq4vj5rbh9i0xr8my5kn147-activate.drv
  /nix/store/d7r3cxymzc8c93dqk072p9bghlm719m1-nixos-system-server-test.drv
  /nix/store/6i53v0bgdcawry6dxivcbqcd16nvx9bn-unit-postgresql.service.drv
  /nix/store/lc0c6rm5hghsxh6mcgp7k8g74cym83pd-system-units.drv
  /nix/store/jjiydqd7gkal1nd0khd4cv0w3ydxjq5y-etc.drv
  /nix/store/dfhny4qjg91vzwh2vsjhps1rkgzj08lb-activate.drv
  /nix/store/vlslbxjs8l5r3dpzkvik0c8b1nxgqml1-nixos-system-server-test.drv
  /nix/store/hilfbmz43h01f793nmirvnd9ncfixx26-nixos-system-server-test.drv
  /nix/store/nbavc99f7v9nymlcm7g29yqmvkawf7il-closure-info.drv
  /nix/store/gp4bazkxa5yj1k0pchf3zzsb829glhzg-run-nixos-vm.drv
  /nix/store/26qsb9lns83ykgi5wkx00d4fr77naa99-nixos-vm.drv
  /nix/store/n7z65z3sym210viz875a475xscjhczrx-nixos-test-driver-pgroonga.drv
  /nix/store/42bwjrcz666z53mcvvsgwkr0mrvghfny-vm-test-run-pgroonga.drv