these 20 derivations will be built:
  /nix/store/amzb4w7x0w4k3y5y1js4574rxahr7qyd-unit-postgresql.service.drv
  /nix/store/p71pqk6x7jxlr0bbbqpbka6wbkb445qa-system-units.drv
  /nix/store/mxdd2b7002h81rkznp0h6bqmlh5r5l99-etc.drv
  /nix/store/33zb6acnkqjsq66fzrd5srilnbh4zyvq-activate.drv
  /nix/store/fmh9lqbhj4csi3sgxpcj1zn93aq88gn4-unit-postgresql.service.drv
  /nix/store/s8rhsyw4578g2787rqr372jw6j8ppm86-system-units.drv
  /nix/store/3v0lqfh9f6ir6hi5lf5vqpj9qbqv4m5d-etc.drv
  /nix/store/ks2whsqzjn436i4842lvcvcqsmadanji-activate.drv
  /nix/store/37m8hw73cbzyadkz9bsl96ixvj8cn4nm-nixos-system-server-test.drv
  /nix/store/njxqmnygwq2kvvi5fr31va18pvj5rb2n-unit-postgresql.service.drv
  /nix/store/3rybsza4wqyjjaqx3xr70j7g82hhqal3-system-units.drv
  /nix/store/hsa47bcvk0wljcx1k5l3amm66bkn7nnv-etc.drv
  /nix/store/jpgnsqmazl6v1r31qnch6i4ssliyqlj6-nixos-system-server-test.drv
  /nix/store/nqgy79m1059f5mgfkyyp5c2ba2lcs50f-activate.drv
  /nix/store/34szvh4ijm5fnqkp1wf176h98nfy7830-nixos-system-server-test.drv
  /nix/store/ralnv4a08is52k1bvcqh4ls45pr1xs86-closure-info.drv
  /nix/store/bh02kk8938pmsc8sg35h7040vh76d2dk-run-nixos-vm.drv
  /nix/store/r36giskaxm50xgkilz6ajy0v6s4xx6fq-nixos-vm.drv
  /nix/store/38zx1ikwbykxky11dgy3nqp09wijh2bj-nixos-test-driver-pgroonga.drv
  /nix/store/v7dnj7jh3wpnc1ic39j0b7q0km1zsmd0-vm-test-run-pgroonga.drv