these 20 derivations will be built:
  /nix/store/0jskqn5sz9r7mabxvmq3gb71ypy47ki9-unit-postgresql.service.drv
  /nix/store/zvxf24lm08al2hr1a84x7hndd962kq7x-unit-postgresql.service.drv
  /nix/store/2vy7rklhy5hw9fd1nhbl4qzygxgnmsyi-system-units.drv
  /nix/store/hn4gcsz53mrs1695nmliy8lsfxjqnh47-unit-postgresql.service.drv
  /nix/store/vllbgnazmv55fi8ji92jly1ig9rvqc3k-system-units.drv
  /nix/store/clk24i54wbyya1yr76rfl0vqvf7hi71v-etc.drv
  /nix/store/lh5fnxkvsx6n1mvkhg4p9pr73d0bj29b-activate.drv
  /nix/store/7yl6ppg1r67wm3ivc7ygh60k5ihxr73w-nixos-system-server-test.drv
  /nix/store/adqpz45g5kqmr7rkwjhmvpmvk6km0480-system-units.drv
  /nix/store/la65vym95qg0nigncpp90m61nvdiqgx9-etc.drv
  /nix/store/8yywy5ykzhq6404vfximm30cjfdrz1vn-activate.drv
  /nix/store/8n1lwxl9724kjr7hak8wvkmf8z8iavpq-etc.drv
  /nix/store/rwh3i5i3gpspr4waqsj5vjk8ss9azl76-activate.drv
  /nix/store/9c8i0pfbs5q1qc97ly1i16iqq24qrw3p-nixos-system-server-test.drv
  /nix/store/c4a6cl8dphdnqbcslaxrk2x8lv4nxgw6-nixos-system-server-test.drv
  /nix/store/xkl609xrgya6hcmylfci15w1jyxqvh2l-closure-info.drv
  /nix/store/xr1fch7vjhjhrwqc1yk7mxz8i0g1qdbj-run-nixos-vm.drv
  /nix/store/80jvrmqx9bdgsbcqlja90qm6203hr5p0-nixos-vm.drv
  /nix/store/inbhhk05xgjayj2vn6zxz8p4i09zi46q-nixos-test-driver-pgroonga.drv
  /nix/store/l1fq65jz01jfzf33c2cmwb60xhgk2lrg-vm-test-run-pgroonga.drv