these 20 derivations will be built:
  /nix/store/c8qzhckb9j35pahw4zpj5q2xfamar4gc-unit-postgresql.service.drv
  /nix/store/zl0y3j13cp05dixrr9fafslma4nj7xip-system-units.drv
  /nix/store/31z7qgqim98wd14biqrgz9ls9vh3aavh-etc.drv
  /nix/store/bvghx2bc2lrrdgb22qk9lbyxa24zpnmn-unit-postgresql.service.drv
  /nix/store/40vnh4pab5plf5rjibzz0wcw95mm7q4z-system-units.drv
  /nix/store/s72pszjxbzxgac96i077m1z6iav8vxny-unit-postgresql.service.drv
  /nix/store/g8p92x5xa7rjzpglffcvqh61qkkms3iy-system-units.drv
  /nix/store/vgvdgw1vny5axwr5vyvxgy66bs96qvjh-etc.drv
  /nix/store/yvj2sf6i8jkn1v6dja0ir6ldrxnngia9-activate.drv
  /nix/store/7z38wwx8am71qzm0q1bcpgj2dp2ib126-nixos-system-server-test.drv
  /nix/store/icaw10aw6zvbhqggj5ss3h1cji5khb9l-activate.drv
  /nix/store/vqxjgf2qq44mpwf9d8cp0h7n2bp671jx-etc.drv
  /nix/store/xjz4cj9qix71m98zlc2zwx0a7k8mk8vl-activate.drv
  /nix/store/q5akz8zq3msjpsgpz7n3kpbm617fzwjc-nixos-system-server-test.drv
  /nix/store/c2xpnb9340s056ajinadzxc0n2bjf1ny-nixos-system-server-test.drv
  /nix/store/pdqd9irsi31jmandddmii3q16ca6k35l-closure-info.drv
  /nix/store/syljbnyllzgac5wxq1lprkybkg4nnjr1-run-nixos-vm.drv
  /nix/store/x0j8byfg75xh3jbw5rsz0nq3g574k6bh-nixos-vm.drv
  /nix/store/n0d8in3la1l4v1s3pqskfk1wdk345s1q-nixos-test-driver-pgroonga.drv
  /nix/store/xyrxip9xvj5wdqnccw0ja8k5v74dn046-vm-test-run-pgroonga.drv