these 20 derivations will be built:
  /nix/store/8pa9rs4k4x6fkkyy5m6nyf33hk1r7kcl-unit-postgresql.service.drv
  /nix/store/jk3ardi8s1ryl3axggk4zw1xv1s09x9p-system-units.drv
  /nix/store/skld4sjw596r8php285xb06hrg42szxq-etc.drv
  /nix/store/9hvibk44s9981g3af5yhzdvxcd0b1b5s-activate.drv
  /nix/store/9kg0bcbr83fncizlnvzd7ssn5rkkal7g-unit-postgresql.service.drv
  /nix/store/6q74brk2fk73idc3bl2117m3ry1pf9dq-system-units.drv
  /nix/store/i927pcdm1vdmqnjpkmzwdqfd9h5i0kzb-etc.drv
  /nix/store/b2jx1lmimlm4v5dpiz0z37vccj6k0cic-activate.drv
  /nix/store/dslipr0454zz1swc8j0m8rzx9syrzr21-nixos-system-server-test.drv
  /nix/store/szfk4k3dkl2q5y6f90y29dgw9si15yhr-unit-postgresql.service.drv
  /nix/store/5z8ygbjphrrypc0j4f14k6ykakg67dm4-system-units.drv
  /nix/store/492wz1c0jpkdfk1rdg47p6hhs2536dc5-etc.drv
  /nix/store/rriazvs8qnvbjngbb2ypixby181akc4h-activate.drv
  /nix/store/k203b2as5v0c6mjl05yg4dh0mh6s3xd7-nixos-system-server-test.drv
  /nix/store/hbzwdphlghn985zifglgki0vnldfn16a-nixos-system-server-test.drv
  /nix/store/bs0n75kzw1mgma1iqghbc2v0qfnsd1by-closure-info.drv
  /nix/store/v8b1lv73yvimyfx0n4bh1pl3s6jby4fp-run-nixos-vm.drv
  /nix/store/vi2myqlzlbr7500fbxlvyvj8jwbiyxrf-nixos-vm.drv
  /nix/store/1zsrglkgm349w7vciv3yk3fjglv84l0s-nixos-test-driver-pgroonga.drv
  /nix/store/9lmcpfi9cwrr6zjhhifkxgx14jdipmmn-vm-test-run-pgroonga.drv