these 16 derivations will be built:
  /nix/store/bp56acx6qgf6ph7k5xy4gxbi5jl1qskh-unit-postgresql.service.drv
  /nix/store/rxzs4lznvx4qrjlm9ndxzhgz3wl0jqvq-system-units.drv
  /nix/store/aa850hxb8zp99fbrbf73894phknpgdjr-etc.drv
  /nix/store/3ghnp7s788fs8a9iqk04471hzb963n3a-nixos-system-server-test.drv
  /nix/store/j1jskygdcm0k17dswg13iv377afxb2ay-unit-postgresql.service.drv
  /nix/store/fhfsk7a60dzsa55vikb29sbv73g6cms9-system-units.drv
  /nix/store/frvil14zm4ybzjlhx515qjw40knkqa3c-etc.drv
  /nix/store/9b1y7fq34rz6mgf0gp1fmpb2ax6ma6wn-nixos-system-server-test.drv
  /nix/store/qhj07ds7jli4kdw3854bqc7299ibrkc7-unit-postgresql.service.drv
  /nix/store/5pc7crzmzvy8c1h7rwq3zxbrdr67l68w-system-units.drv
  /nix/store/x0vz9z39ibs1fcmfva3hnjpw6w3l2b18-etc.drv
  /nix/store/r2r7dw86hj7wi1li5fhmx0aw1cd2x6iz-nixos-system-server-test.drv
  /nix/store/m292wpcxq3dcd189hfwmaklx8a7wx5nc-run-nixos-vm.drv
  /nix/store/fkicqmf50h8fg3rnvwr6df7sskvlrlw1-nixos-vm.drv
  /nix/store/2s90qpw416xnq6w46q5zcgk0jvlv39s0-nixos-test-driver-http.drv
  /nix/store/a754f596jdhi56jxpmmr8w90yfcm0lbf-vm-test-run-http.drv
these 14 paths will be fetched (125.6 KiB download, 884.3 KiB unpacked):
  /nix/store/0z1769xx6hdvh6gv5b4fblb77cknyqh8-activate
  /nix/store/bz0xfl4ngcip15s23rrh2d6ij72a8zpz-activate
  /nix/store/pzjm830bn58zmy9fdkm045yhyssvl58x-activate
  /nix/store/bm2dbi8wjnspfhl20q7py5gvq3d2d0cs-closure-info
  /nix/store/33y3rsg5q3gzrrr2qr9mxafw97h7gc7r-etc
  /nix/store/pn4nak6km26vm375wz2dni44wym7gs18-etc
  /nix/store/q2hwlihcdgpxnyk08m1h31xms9fhzhpv-etc
  /nix/store/rm79vrnwypn7vzk767ska1czj3wga3y0-nixos-system-server-test
  /nix/store/6xf97jzzr0fqsgmmn34hfg0ylq3qnilf-system-units
  /nix/store/8cgs5jqsd3clcl69zjdblrj5m1cfv1f5-system-units
  /nix/store/cslh07l0x1svimbb2hmimlir890p2gzf-system-units
  /nix/store/0jqx4d1bxgcnskj3203aqdzaiwk2rs0s-unit-postgresql.service
  /nix/store/j9iknn9m3w192hnaqy3c4q91hd3s7qlg-unit-postgresql.service
  /nix/store/mfn311ydl6cv0z5kawkl7balyv0bsqiz-unit-postgresql.service
don't know how to build these paths:
  /nix/store/0k9dmv98ghxbhgcmyj3ygnj1i9j1vgns-nixos-system-server-test
  /nix/store/nbz1nc2ra2hx3rinqklf2lmrahpaak1l-nixos-system-server-test