these 20 derivations will be built:
  /nix/store/qkyscqkhyij85rmq3vx1y7xhwcar2zn4-unit-postgresql.service.drv
  /nix/store/2mbc070ccj89lrx5fj1f97wpvrwmnpir-system-units.drv
  /nix/store/hgpl4i136rhm1y0s3vwnbgkjcak9hgy0-unit-postgresql.service.drv
  /nix/store/ad1wq4w910myq18c3jnyn1z3j6llxr1h-system-units.drv
  /nix/store/zhp3d3gj442qlhykf0c5zwf3r7nc4j7m-etc.drv
  /nix/store/nf8m0mz0q7vbqbkijd1q4pr9japss6g0-activate.drv
  /nix/store/bwx9dd1b15cha4caw5vpr42i6dx7p427-nixos-system-server-test.drv
  /nix/store/x4dx3pflz5l3lpm0999m99r5ipdi4jyj-etc.drv
  /nix/store/w7hb02di32hq4gaa8zc0msis9vh70zb7-activate.drv
  /nix/store/dwk1pb9rggz0g88pgba9k61vc21py2a2-nixos-system-server-test.drv
  /nix/store/k86y1xk1nyf2wb6mvj3j8figvwwhn3i9-unit-postgresql.service.drv
  /nix/store/yjf4pcxi2cdxf4kmqymg74wblvqn0cvi-system-units.drv
  /nix/store/nlzz202z9kxgyyjbvrkwsp0c6cqhdzfw-etc.drv
  /nix/store/qxnpvwkj13342b3capq70kg7zhc3pmym-activate.drv
  /nix/store/3yk2fsmak7jcn540hfzdlc8mqxa77gxr-nixos-system-server-test.drv
  /nix/store/66wz0yhdf7mha2cvac9gj7phy22svmfz-closure-info.drv
  /nix/store/3jf7g6xmr04ajyi4zhsshapfjfpmhpsq-run-nixos-vm.drv
  /nix/store/araa6fylbjna79ybswgr24an6z3mcglb-nixos-vm.drv
  /nix/store/83zpqj9zrwhafkfaa213lspifin0iw37-nixos-test-driver-http.drv
  /nix/store/4pya4wxcy7d69y0s6h7gf23d5sxy1gb2-vm-test-run-http.drv