these 20 derivations will be built:
  /nix/store/9vh3hdm33c8455ka8n59s0c53wyzpd5j-unit-postgresql.service.drv
  /nix/store/a8sisjg5yqiybik10phkkq9xk8wgf9db-system-units.drv
  /nix/store/svi4f492661kjxfflpsqs7niglri6zix-etc.drv
  /nix/store/rqys4ijlhvmri2b1qqm153grzr3s89za-activate.drv
  /nix/store/3mq1pdnyvvs5zhaz5y1h8k0q5bhv0c66-nixos-system-server-test.drv
  /nix/store/357131754cdnhdy2wkn843akrcvjg2qn-unit-postgresql.service.drv
  /nix/store/gysv9p8if1812267c791673z3m9z4cfi-system-units.drv
  /nix/store/avm0gymb0ndhf5fl4hamzdbps89mji10-etc.drv
  /nix/store/plvsy1gspgw9nq9fvcqhmcbw20przg7v-activate.drv
  /nix/store/gas2v0wr70rs2hzx5p2cqi0pnc40s33k-unit-postgresql.service.drv
  /nix/store/w8n1x7ly4v3bjp67qnxsw4z1r91311vk-system-units.drv
  /nix/store/gcgh8czd6c8qjsp2wd7f22n6hjj1jynn-etc.drv
  /nix/store/y66wgy8wkka3mrcpv588xafmb8ljypvd-activate.drv
  /nix/store/q2djk8gk6fysrgi3m4l2z2wnrlya8fm4-nixos-system-server-test.drv
  /nix/store/rdgjandqwk3m6dgwkh885463jbzvmvr9-nixos-system-server-test.drv
  /nix/store/034xwaa56z66idd97pww4hf193kz4dx8-closure-info.drv
  /nix/store/wwbq3wjfcbha3gfbhn0mlw3bfh3vcq05-run-nixos-vm.drv
  /nix/store/096jwwyipd6j7vkwlg6pjh3hrn47jfl7-nixos-vm.drv
  /nix/store/l6gwd60ab6npmmb1mbjdp2bd8j0ykal7-nixos-test-driver-pgroonga.drv
  /nix/store/18wprp8agx4ydkxzm2941z5k56ia9srv-vm-test-run-pgroonga.drv