these 20 derivations will be built:
  /nix/store/x4pq7dhlviknkrqil57gx4g43i1ha8gf-unit-postgresql.service.drv
  /nix/store/061770nphfmrx2srhvq1hgwijhqnn44a-system-units.drv
  /nix/store/q46krwwvzvcnb4xjh2mi7biqpia2s88c-etc.drv
  /nix/store/d1wvxw38ddm9m241pgs94hxhjbbij9hr-activate.drv
  /nix/store/3b28kaxyaihy6vci0jd8adq5mgilffvx-nixos-system-server-test.drv
  /nix/store/m1d6kkrvm3ckxgkc8iym0z6fk7899wd7-unit-postgresql.service.drv
  /nix/store/rw76xxmgxa68ndihgdpcmq48vdknvh9d-system-units.drv
  /nix/store/n37mnljrdikqwzq6ljrvfda7jc7w5fas-etc.drv
  /nix/store/gbkap6mj57756msgm9bgnvwb13z5agjq-activate.drv
  /nix/store/w82273lmvpjyrnbxn32wwf9993x4y086-unit-postgresql.service.drv
  /nix/store/jyjmrh50gz0rpkg51s33b71h5kvny7pa-system-units.drv
  /nix/store/vznxq38vw6jii03akfb4fy3b5m47lws5-etc.drv
  /nix/store/sjd78x5bvxld76azrkndk8alzhc6hc5l-activate.drv
  /nix/store/lka2xx819fdm23kfl86m10wx1mz07w08-nixos-system-server-test.drv
  /nix/store/8v8a26zh8acxdkzs802lvkqjsvlxpwbm-nixos-system-server-test.drv
  /nix/store/wwczhlsl02sz482z299ykv6lp27mllw7-closure-info.drv
  /nix/store/iln89r5phcsmwf8niq0jwizslw0z7jch-run-nixos-vm.drv
  /nix/store/blgccgpldlzzr52fcqyi05h7jfdj5r7b-nixos-vm.drv
  /nix/store/n0cfxh845qvcfhn16hz9ydrhin8m6ybi-nixos-test-driver-pgroonga.drv
  /nix/store/h5hs4rx2p3fx9xjg3lqbx8x216akijvh-vm-test-run-pgroonga.drv