these 20 derivations will be built:
  /nix/store/bf50px3bknaiipg5dz25hi82cvh0bvk2-unit-postgresql.service.drv
  /nix/store/52p17p7xncz7z9sar0vj2si7wyq99jjf-system-units.drv
  /nix/store/w5s6yci4hhmkrc6pg0k56q6lgvw6zpsm-etc.drv
  /nix/store/jd7k8nd81yaqbcw7cy1wxa1qkrlfj834-activate.drv
  /nix/store/srq709k3hxs2fnb97iv0irhyfggckify-unit-postgresql.service.drv
  /nix/store/767kfhmhazbm7riv7ych81i3yfaj64aq-system-units.drv
  /nix/store/hyz71wm7k0vxj4bjlchyj8i6wvyq2yqc-etc.drv
  /nix/store/dx90qj4xadzyrql6r0xl05z9adhxsgn6-activate.drv
  /nix/store/r93hgw4kr753igvh80cx9p2jcjgr7i0k-nixos-system-server-test.drv
  /nix/store/f8ggjl5dscvsy32r2mi3w9xd2wiikxhj-unit-postgresql.service.drv
  /nix/store/y9ns952imvcfcrplb31z16lm103fi6fp-system-units.drv
  /nix/store/jwlpkk5dzkvmb7za3pdjqz2pc966ds8q-etc.drv
  /nix/store/vfn4g9wqam9xni4rva5m8mffhfg0sr95-activate.drv
  /nix/store/viffkvlaxxk097f1k2ip1nxqqw022c3y-nixos-system-server-test.drv
  /nix/store/mx6vv12gab86dfl0i8fb7dpj6q6iifk5-nixos-system-server-test.drv
  /nix/store/kcx36fl5hdlqsyib7irnil0z65i3mav1-closure-info.drv
  /nix/store/aihb37h01zvk3k9cv7dirzj6c80kaiqb-run-nixos-vm.drv
  /nix/store/0hyrr2xrnpq0gfn03bfpss04d4vf6bzh-nixos-vm.drv
  /nix/store/jk17ys2rrkx2j4yd3m5rbrfgqy9djwq4-nixos-test-driver-http.drv
  /nix/store/ks9ns1a62np067jw7vy1lzp5gg8x8fp4-vm-test-run-http.drv