these 20 derivations will be built:
  /nix/store/f2jv2l3d561x33hn0a382hf0cs6zpxri-unit-postgresql.service.drv
  /nix/store/z9q39cnsndabad0p5bxc8kqcb1h5yv3d-system-units.drv
  /nix/store/6hhrrg0qxa4fxqh8yach23shkfj0rpl0-etc.drv
  /nix/store/508iiwyp5h79zjlwakd2p24fanzxx3hj-activate.drv
  /nix/store/vlc2b1nlr5n4nwsldqfqy69465frddhd-unit-postgresql.service.drv
  /nix/store/824as81kzwnvz2whzrf6wk4cwp6d7gb9-system-units.drv
  /nix/store/bs4dj9zamf5k4c0gmprm7gmgnbrk9slr-etc.drv
  /nix/store/blnz7yckvgyhpg81baqdq7h98g30c27k-activate.drv
  /nix/store/szyrjvn1rs44dh9hrbr2m7f7hi3xia1h-nixos-system-server-test.drv
  /nix/store/wvbi1l10jww6vp6nir1gsbxjj9r514k7-unit-postgresql.service.drv
  /nix/store/h2ly2ybhqh71m670m0ll138kml5wm89i-system-units.drv
  /nix/store/hrj098j8i5pksgm5l4n7ypb7zlfr62x0-etc.drv
  /nix/store/82xx0l47kysjv3kw9hw2pyfhca9z0msa-activate.drv
  /nix/store/vajnaw508nbpjv8d6775ibmimykf7zq8-nixos-system-server-test.drv
  /nix/store/3bpgzg7q4yr3gs4s70959in7d79b2wgb-nixos-system-server-test.drv
  /nix/store/f363hrk1gvgzg0m3akg8p9fj86hqjn1p-closure-info.drv
  /nix/store/6xwaapqq8v93pwd6ljjqa9bz68ll3d3z-run-nixos-vm.drv
  /nix/store/r7vh9z2jigyrjghijmlfxij0yxjrxdbp-nixos-vm.drv
  /nix/store/751qi2jhwv8kbgsyys5dxr2c98d8prpm-nixos-test-driver-http.drv
  /nix/store/wlh5gnb5prz186g25dpcn96nfirg4x1s-vm-test-run-http.drv