these 20 derivations will be built:
  /nix/store/y0j2slsidw4qdwqyr7x6n3i6fmhv2c31-unit-postgresql.service.drv
  /nix/store/0pdyshbgzlxlz5y1xax58mjwz8rmfr6p-system-units.drv
  /nix/store/srd6vw8jmi94gc6rkjc8z7rcp6fs1lab-unit-postgresql.service.drv
  /nix/store/fk2wrnw96h7xhnk5s7p8hn1hslk7b2ka-system-units.drv
  /nix/store/qk0ykshkl05vh2hz9xrg5pl8s4n3bmq5-etc.drv
  /nix/store/19sn6hby4hqkp2w4ggrsj61ivjp61kfk-activate.drv
  /nix/store/mcm8wa8gjvkdzawsmw9iprdvj03z3kzx-etc.drv
  /nix/store/33whyrqwdg0gs0z3wdv595dl2w9b6rh9-activate.drv
  /nix/store/d5da4vn411h9m6qw0c9ydz5dhnmwg4sz-nixos-system-server-test.drv
  /nix/store/al1gbsjx9db20kfndr1ash359ll79kpr-unit-postgresql.service.drv
  /nix/store/vxbka44d7nxmb2kjczllr9f9fvxpgbgs-system-units.drv
  /nix/store/l1p95v3cbi69jbr1dfg9frgp18vqi486-etc.drv
  /nix/store/ydh01k3kclriy6nz8imkk1xi5k1dyyd4-activate.drv
  /nix/store/ql4b2snx72ijbv67si8zkw0ng4vyvypb-nixos-system-server-test.drv
  /nix/store/2ma8pb8fl11wcnb11w2a9x8ajh6ky9wv-nixos-system-server-test.drv
  /nix/store/spmk2mxxnzsncga00q8s2m10fr3sv1pg-closure-info.drv
  /nix/store/6dppcfxbm5ba7bj3azgg6dxhlwhaaq39-run-nixos-vm.drv
  /nix/store/hiz8ldqkhlxfw49vvja84ipz0wbgybd9-nixos-vm.drv
  /nix/store/fblh7py80937m1n1g5pc6n1gc3dkp0fx-nixos-test-driver-pgroonga.drv
  /nix/store/8ngmb002b0i16z876bqxxslhlxxcspfh-vm-test-run-pgroonga.drv