these 20 derivations will be built:
  /nix/store/p1fjdnhryjd9xpk58gb2k75cdliqikqn-unit-postgresql.service.drv
  /nix/store/3pb33qph4mzyjb4cjb3ws7m5crhvs5w7-system-units.drv
  /nix/store/4vqjgm0khkspmlw13n9z4ggjlz14x3kk-etc.drv
  /nix/store/4ipssi3ddsbh9346i8ssfrimr21bk9g2-unit-postgresql.service.drv
  /nix/store/psnraywpdrzgpxfmv0dvs9z9zl2d238a-system-units.drv
  /nix/store/8j8svrbk3wzkyija59pq0hhmrvh9149i-etc.drv
  /nix/store/wi6aq2ds2ppc7bls0s8qjw4mkjrsxxv4-activate.drv
  /nix/store/5n9l4p9q06dy8m5c4qp03xxcp69sjnv5-nixos-system-server-test.drv
  /nix/store/gf5csc5kczghzfwmf2kab1zzasg39rxb-unit-postgresql.service.drv
  /nix/store/7dki7gpxk8l4m5x2j5igsq9j4p269w9r-system-units.drv
  /nix/store/bdd1mbbzxs8f0ikzhaqqdiii7fg3axc9-etc.drv
  /nix/store/2b5id2f04gkpcdcikrz6ny0qrpfy1khg-activate.drv
  /nix/store/dl2l2w91qlxy8c7fgbhya586nb1hk6hy-nixos-system-server-test.drv
  /nix/store/fcq6n8y8wbca9wd030awzn3g98hg8jk6-activate.drv
  /nix/store/dj69rmwjsy5jdqlmlb9gy85xjfk14p5c-nixos-system-server-test.drv
  /nix/store/3rf36n8g8qz5v4da3wx85g9gpdldqkzr-closure-info.drv
  /nix/store/s7vfj12a66xn49af20xhgilib626vvvy-run-nixos-vm.drv
  /nix/store/farj1kh27v9lyz0hwd4fl4bj1602wjy4-nixos-vm.drv
  /nix/store/1j75sqdg9pk0md6i862bczlrm814hdic-nixos-test-driver-pgroonga.drv
  /nix/store/bdr52q8w0vrsivi2c40i0kcfjsfvnz2j-vm-test-run-pgroonga.drv