these 20 derivations will be built:
  /nix/store/2k0ppmrc734fd8wljgcqrgbx7z7mncmy-unit-postgresql.service.drv
  /nix/store/ymc5ii3gx46vzr3gg5iwgqmr5c74qc1r-unit-postgresql.service.drv
  /nix/store/km9s2bxik1ics5dn6l9yfb2if4j4kgsx-system-units.drv
  /nix/store/x7z3qgpk2qwh2fcrj4dzm58qf9mhqsr5-etc.drv
  /nix/store/cydwjihvmcw8xwfhjk8yg1ipqvnqprdd-activate.drv
  /nix/store/8xlsk0cdwhd1xyk65j0qdq531b3aisgj-unit-postgresql.service.drv
  /nix/store/jn550psqfks7lg9mcl2l03z59y5d6q95-system-units.drv
  /nix/store/ckmiax8kx99w7bq1qn5zcfhjir6x60g3-etc.drv
  /nix/store/h34gy9r5ljxqkkw00x53yykmfxgxly15-activate.drv
  /nix/store/kb2a0gid7p2aknzpi1l6xiv5lajk8yky-nixos-system-server-test.drv
  /nix/store/5p7jc2yav627ydv0bmjd76afdibahdam-system-units.drv
  /nix/store/cw43zw3pg0qsrnx20qcq1skznzzjpmbd-etc.drv
  /nix/store/7bxppgnn4a9zm4xgwi3fs3nf5bpgi4ig-activate.drv
  /nix/store/wan1pqkyadnrkyllskvc70mdyx3k1xmn-nixos-system-server-test.drv
  /nix/store/xxbxlq200dy5kq7a4adqw3ab3wm9wx4r-nixos-system-server-test.drv
  /nix/store/p15pnpa6zljzbhqk82na1rwni3vinhqs-closure-info.drv
  /nix/store/x1yng5nb021s0644sksmm6y1qdsn2dh0-run-nixos-vm.drv
  /nix/store/8lxaybiryp9h2cnp0hmflqdrzw5vwzym-nixos-vm.drv
  /nix/store/cjj0gng65bbzrjs96sjil8m2jxrgfjbf-nixos-test-driver-pgroonga.drv
  /nix/store/3qw2pchm634iiqbkwd6j7469blgpp994-vm-test-run-pgroonga.drv