these 20 derivations will be built:
  /nix/store/257x2wp1ajmywmf87jn2rdb7d3aihldy-unit-postgresql.service.drv
  /nix/store/bkfc00a0jwricicd72c3hdzjjpsc4ijs-unit-postgresql.service.drv
  /nix/store/855cnd2pzixzv1za0v00wkq33rkwbg6z-system-units.drv
  /nix/store/2jpvxb2jcmhhd4fs23zpxc2lkpx4hy68-etc.drv
  /nix/store/j7cf309idr377c9g2jnfvrqa76j6q4l9-unit-postgresql.service.drv
  /nix/store/3rf283g5l4mq9pmpbvhi46xh9731330z-system-units.drv
  /nix/store/ydyzs610jp5dwbpmvbq162f4nvgpr3sw-activate.drv
  /nix/store/9ddklbb3z29jiyyark0xcr8fy5ja368h-nixos-system-server-test.drv
  /nix/store/blh0sl6p8dy8fvvwxwm8rhhlj4lsm57j-system-units.drv
  /nix/store/mr1vrkihx7y9pqkd5jmmgid2l4wnlhhr-etc.drv
  /nix/store/92lkicg61wlwcyav6x4swz48ryrw1cgj-activate.drv
  /nix/store/n2cgx8ij8fiki3ykddqq65cg3lszff2d-nixos-system-server-test.drv
  /nix/store/ssq7g0y9m70psk2mw6wyviljmf0y55my-etc.drv
  /nix/store/w7c3fiispkm58zvq73p65bdh7khxlgq6-activate.drv
  /nix/store/p7n8azhq23663vkv73mrkawyqzp23x3b-nixos-system-server-test.drv
  /nix/store/k3iiv907lszq4fg2nrcd8dai0hbsds9b-closure-info.drv
  /nix/store/xf2bp70rnwi4mgkdq8689ab3w2f68453-run-nixos-vm.drv
  /nix/store/84bqcqz2nka1hcjdw8699mfvj56bvdl4-nixos-vm.drv
  /nix/store/kv6jals4xk8yia1slr1br9lvg7638kmk-nixos-test-driver-pgroonga.drv
  /nix/store/r2lm1gp73r27mf5021qwffnkg526h4xl-vm-test-run-pgroonga.drv