these 20 derivations will be built:
  /nix/store/9hara5q5xaf87d0g35wxz3nvd3gzdry0-unit-postgresql.service.drv
  /nix/store/8w4q0vny5aa2j20r36ngh9ajg6nbvzym-system-units.drv
  /nix/store/0pxwqmkh9ng9ssbsamfbnc48k1s3ar30-etc.drv
  /nix/store/ncqgnc6n171zh58if2w02dzffwqwp6lk-unit-postgresql.service.drv
  /nix/store/0xpjvf7bgqrlcn6p5rcmfj8dks8sqs38-system-units.drv
  /nix/store/z7wskd7rzjs08igl680vp519cgqvf42a-activate.drv
  /nix/store/2swa3bglqcxw0rp5m4lpy4rss3hkzndv-nixos-system-server-test.drv
  /nix/store/i30lig1x8s8csx07lziqmri18bm5x2r8-unit-postgresql.service.drv
  /nix/store/kqs2d4aj52zaz3y1r2rmr6ffp2bmwdm1-system-units.drv
  /nix/store/s1agp61gi30cbi5hm9qvgr2mm1asq14y-etc.drv
  /nix/store/vq19wav76kbjaj0rz3daj7k6c3naj5jx-activate.drv
  /nix/store/5fv9p2k1m7jj4m60slmvh6pq9zqxqb4n-etc.drv
  /nix/store/ggs12v55jwdwsx5wkzazsk6hdf8apnkv-activate.drv
  /nix/store/wdr8zi3gwbbakki7hsy625zw50cmapbb-nixos-system-server-test.drv
  /nix/store/yx6j5h2807ja97mcy7ky769b821zl9d8-nixos-system-server-test.drv
  /nix/store/2r4cfvz3gml4adqq344cmk86iyhh8bw0-closure-info.drv
  /nix/store/sa5c68kpgsw5j416609yh3lamj9yb1f5-run-nixos-vm.drv
  /nix/store/hkxk3ba1rh5xbkxp1w23fzf1dr279b7v-nixos-vm.drv
  /nix/store/i7isw26yaphxzg05z9gdsnwb8hirn2bf-nixos-test-driver-pgroonga.drv
  /nix/store/gf2khbhzs4sjr24l4bh22phs8bzgi7in-vm-test-run-pgroonga.drv