these 20 derivations will be built:
  /nix/store/qcg8rnlfvhkxfplyck08b4pqkjvdfpqv-unit-postgresql.service.drv
  /nix/store/hkdnky2nvw6r65cdy44ggd9sb4vb8lvz-system-units.drv
  /nix/store/jnpbykmyn35ffyh19b7rn2hxnglh1hbg-etc.drv
  /nix/store/kblyishi5yp6mgibx7szn9kzqfishnfw-activate.drv
  /nix/store/0amg03nc670ji1f44yh5an98shg14gs9-nixos-system-server-test.drv
  /nix/store/wbz19zi2nrkbkzdkrikygih03rgpjqq6-unit-postgresql.service.drv
  /nix/store/fg9rqmv2nlwf3cx8wbgrps4bravba1n7-system-units.drv
  /nix/store/wjfr5hdf1jg0zyv0b44xs3xdw9n55gs2-etc.drv
  /nix/store/2ph7ww15ki43fbrn1s8ysy6g230qn7vs-activate.drv
  /nix/store/7jn64rrpxpyz4fvhfi5gah80fxz74xa1-unit-postgresql.service.drv
  /nix/store/q3m5jqf7z2x6d9xi310s3xdnzzhcm73z-system-units.drv
  /nix/store/ikw5iiwnw2slma5d9wifxly62xdy01p1-etc.drv
  /nix/store/aiazzcfaz7j5z4q4v79xca84nvll68ax-activate.drv
  /nix/store/9gmk45v3jvw8s8dw9647a1m6pj9p7b1l-nixos-system-server-test.drv
  /nix/store/j853d7f3wvbsh7sv7jdvi5mzp0id9fh8-nixos-system-server-test.drv
  /nix/store/gx34fgca0pqj1xhhnk065kdfd453mlds-closure-info.drv
  /nix/store/dv57aqr6z9yg5yr1dygd7hwyb29zry7q-run-nixos-vm.drv
  /nix/store/3k7ipvfqpsfqrwx5v13di6lnvlmrrvny-nixos-vm.drv
  /nix/store/0qy7lsmab6ci35iphvv9kj3q80cdr0kx-nixos-test-driver-pgroonga.drv
  /nix/store/gnbfzs2lwxc116g0i00ic57ssz0k1j6j-vm-test-run-pgroonga.drv