these 20 derivations will be built:
  /nix/store/gxzsqihg7l2pgrk3v8ndqavsp3ild5si-unit-postgresql.service.drv
  /nix/store/1syh2f9353s3s52r8s6iaq5vagcam7mc-system-units.drv
  /nix/store/akh055bg7nzwd5l0ryvvyklrz4ad7p5y-etc.drv
  /nix/store/g5xsgka89inmjrpz0k5qsjflyp18rvxa-unit-postgresql.service.drv
  /nix/store/qaybzwdbs21gx59iqj6yicgikiv2lc3h-system-units.drv
  /nix/store/5f96hib8cny8nh1nbw4ds0l7zjh86qlv-etc.drv
  /nix/store/j0liw46pi7pibbp1sinadmk9jhcn79aa-activate.drv
  /nix/store/h03pya29ha10c86wa9fvgppzw7cxvf2h-nixos-system-server-test.drv
  /nix/store/jvz9h3kir099jg4azvxmamkb754b2agi-activate.drv
  /nix/store/qm9g4m28jsbi4xxk96f2pkg7i4a75gmz-unit-postgresql.service.drv
  /nix/store/shz7m3bjx5zjdlnki4gsmfnqzzasvsr0-system-units.drv
  /nix/store/a6p27n64bbdpdyyp7pd253m1zm1ndlhi-etc.drv
  /nix/store/g6rfrcnf570xigm4lg9lhx08i42iqhnk-activate.drv
  /nix/store/xyhdc0d8qqqn2s0gps2hvrg9qhydp37k-nixos-system-server-test.drv
  /nix/store/xcwx6h61x2mgd83dy1jpxy7267ydzf7k-nixos-system-server-test.drv
  /nix/store/21i6mvvkmbmpkb5i81jawghsc3s7kqcs-closure-info.drv
  /nix/store/hgv8p3niyjbax8czc4w6yzlcl1cbnx16-run-nixos-vm.drv
  /nix/store/2vyrb9mmhjzqzgn0351na97f5h5mfib8-nixos-vm.drv
  /nix/store/qgz353gcgs3rrfniy32x644v58sq41g6-nixos-test-driver-pgroonga.drv
  /nix/store/8ngjm1hr1xx6rmhahb78im6fpl2rjvhq-vm-test-run-pgroonga.drv