these 20 derivations will be built:
  /nix/store/gbcgnl8hszhq858dpq598ipghzxwgam8-unit-postgresql.service.drv
  /nix/store/17b117j5c1p06dyaanz8pwf3igrfqvx8-system-units.drv
  /nix/store/1qkga9l5y6xxzfbif0y2smcds5zndz3b-unit-postgresql.service.drv
  /nix/store/qbkm6nazxxh6g5bp6gdh4g98d5sbrwsx-etc.drv
  /nix/store/2a3inwphbjfjlb8fjb4gbcyih36cvkxw-activate.drv
  /nix/store/pg663d858zkc4n09a48np9b694v5lsvi-unit-postgresql.service.drv
  /nix/store/c74p5dsny8n3jnw31brh866fja9m44d6-system-units.drv
  /nix/store/6v6ddajdal0prx6iza22dz6nrx1rfiy0-etc.drv
  /nix/store/b5hakacxn2ry3h86ipx9ma11c6pn9d0n-nixos-system-server-test.drv
  /nix/store/lnvi1ffn8mgk04yviqh1dsiifj43vrkz-system-units.drv
  /nix/store/b1pq1h6lv7b82qh42xy5hkcylnc1j9lv-etc.drv
  /nix/store/8c0jr89glasqrb6qq2aaq13iq3jvhvpy-activate.drv
  /nix/store/fazkp9lm7l95kfzg8lgy08ip9r4q0352-nixos-system-server-test.drv
  /nix/store/jn94zv5vihkkfl5vw89im71sxarr1haw-activate.drv
  /nix/store/lbww10pskdqigdvn1pmp7k5zzw64x4l2-nixos-system-server-test.drv
  /nix/store/99lyld77h3r2v3crh3ly2p2lp33hfc9l-closure-info.drv
  /nix/store/3ifcips5gp06nhlmmrs7811l8qlnjyj3-run-nixos-vm.drv
  /nix/store/x74cpl7pki7hpz6dv494x6154kgi4q85-nixos-vm.drv
  /nix/store/jybbaj14209bn9ia22ba2648zl5659br-nixos-test-driver-pgroonga.drv
  /nix/store/xx7n2rx8pisrcvc493a6ypd6bfcmp0kd-vm-test-run-pgroonga.drv