these 20 derivations will be built:
  /nix/store/3ikh930z2vzlxgw5s1ldjs50yciq7s7g-unit-postgresql.service.drv
  /nix/store/jlx0fpjm8h5xvhrbgxw7lzkk57b5rimm-unit-postgresql.service.drv
  /nix/store/hhn6biibwhnkfnjpx501b1m1alp86fpr-system-units.drv
  /nix/store/4anqfpbvbp0ca4bi9qm9r6wvirx62ijh-etc.drv
  /nix/store/63qfgxwg2bfa9d7vvrhirkll5a59s3kc-unit-postgresql.service.drv
  /nix/store/zs3hyfgx3piyasn5ndl0rc2fixg2bn34-system-units.drv
  /nix/store/glz2g5x1dwzwgchbdlp81zhiy8n7fv08-etc.drv
  /nix/store/r91nnkhl0bhv1djh1si433ybc5a0q02k-system-units.drv
  /nix/store/nm47aizzbv6kwkg6m57qsqf9dir6cxpb-etc.drv
  /nix/store/pz22qzr6a2s4ybzzzm2dnz2xls3arz3s-activate.drv
  /nix/store/iq2s97sp4xqjn466c0vh2iqsxalwq218-nixos-system-server-test.drv
  /nix/store/89bvz1lfgby4zq1pyk7557wd70i1vr34-activate.drv
  /nix/store/ldplxfws4qpmry6v56y7h0x8sjcbjnl1-nixos-system-server-test.drv
  /nix/store/yar202arv9kwwk5y1h6yhdwzncjas0ba-activate.drv
  /nix/store/n33l9m7dnzhsdy2yn4b05f0w7fpcscig-nixos-system-server-test.drv
  /nix/store/b1fmskksxibzhqmfhf01sri1a6636f56-closure-info.drv
  /nix/store/kry3vvx2azbhi6dzj7fb92cwv67gcyy7-run-nixos-vm.drv
  /nix/store/6760dm2jnrdwjrmhlknhgw022qskkms1-nixos-vm.drv
  /nix/store/bxii41wk35nx46p5h3m87ibdkj9sss9c-nixos-test-driver-http.drv
  /nix/store/8yb91qqn19psyzk1s0dk77brgyjb3vcm-vm-test-run-http.drv