these 20 derivations will be built:
  /nix/store/19n15lkpwhmpa3rgnzkr5baw5823badc-unit-postgresql.service.drv
  /nix/store/l1fqpmqnycvf5mxr2da3i49h44jfmmbs-system-units.drv
  /nix/store/fpkk1ysf229knla37fc6wykg20q3rkah-etc.drv
  /nix/store/k28jk5av68dgvzxpziixl91pwvh9ngym-activate.drv
  /nix/store/0hvfzy9k0spcqv5h0p09qvqcfki3fl5a-nixos-system-server-test.drv
  /nix/store/dhrndlij3pkcvw6vwwpx3my9ipl396i5-unit-postgresql.service.drv
  /nix/store/1mi9rjvvsfy04swqf0xhv51bbc81z1v5-system-units.drv
  /nix/store/691v8n89viy9px323rfk9kn2h6dyv4lq-etc.drv
  /nix/store/2ax96wd0ps2bdh9np1l6d185z1p6h4s8-activate.drv
  /nix/store/fn35jl8qi4z1vni8xl8w0yw9jq3rz27h-unit-postgresql.service.drv
  /nix/store/yil85k9aan12i53728yki31x197m7gn1-system-units.drv
  /nix/store/sdfpxcpni39lnr3va44m68rx9y4c2bh0-etc.drv
  /nix/store/v95vb0kzc2ypzgy5iffn3saz1yl5n996-nixos-system-server-test.drv
  /nix/store/zlahvl3m22lqcsbyfq0w3an4axwq9cyz-activate.drv
  /nix/store/f5np9p3ql8q4mrhx12cqqdddy5piaic2-nixos-system-server-test.drv
  /nix/store/prqrf4rxfhmpbjpifl131ahm69b77i3r-closure-info.drv
  /nix/store/xmcjjyy8pj3xzlycl7sqkzsxvrrnrq8z-run-nixos-vm.drv
  /nix/store/4g82qpp1770k6w3969d486nv8x96f1pa-nixos-vm.drv
  /nix/store/867byi3n41cf90ybpbq4rmqcg85148vp-nixos-test-driver-pgroonga.drv
  /nix/store/6vb2qwwnvhqw2sb0aiwqclbjsdgsdacx-vm-test-run-pgroonga.drv