these 13 derivations will be built:
  /nix/store/izz4fi6j39b4ix7vwlhvq0b80azn4ki8-nixos-system-server-test.drv
  /nix/store/rnlrv1mafpwr0id5n5sy7vir8nvpifns-postgresql-migrate.drv
  /nix/store/3ajawim31d13n25vmzjfz7swspk87llf-unit-postgresql-migrate.service.drv
  /nix/store/j91nfi9v3khdr0cyd387si3k9xzga2wk-unit-postgresql.service.drv
  /nix/store/pzs57y099jc712jmpd1xpqks5rqp7zps-system-units.drv
  /nix/store/i8q2cnd82virpza1ndyfp5rpgcbm8rpy-etc.drv
  /nix/store/nx7qgcg0mla5ihhhgrnzms0mrqkb7lmx-activate.drv
  /nix/store/pqprk50b1rrldagj498a72glg8qkjz4j-nixos-system-server-test.drv
  /nix/store/0r1rs7h0vd2mx3lcvinav06xfkg18px4-nixos-system-server-test.drv
  /nix/store/2k2xpfqy92gizilqql5v2cr2i7rzaqk7-run-nixos-vm.drv
  /nix/store/nqivn4qmz9ngq9l2ybwk9yg17k0m0j4m-nixos-vm.drv
  /nix/store/64racjjpk94l6rh0kk96q5zkj29rbz33-nixos-test-driver-postgis.drv
  /nix/store/8lga98hxr8ndmj49yq5lxl55i0f72yx3-vm-test-run-postgis.drv
these 5 paths will be fetched (88.6 KiB download, 560.5 KiB unpacked):
  /nix/store/qjgmrihxs526h8mf5bnkpq2vddswz2jx-closure-info
  /nix/store/r2ap1m85f0d4npp2fswd9h8arccd5jci-postgresql-migrate
  /nix/store/sg3dmlfrbrcnm1dv262qz0ag1zgz3x95-system-units
  /nix/store/kkqjv8pz2xlvppzkwjwwjj42hgfwg21l-unit-postgresql-migrate.service
  /nix/store/3vdz2167a5x96va3q2pigghnr05fci3s-unit-postgresql.service
don't know how to build these paths:
  /nix/store/1a38n65x2zfx87g594mvjd34zm73nqx0-nixos-system-server-test
  /nix/store/9imff8szsik5qxxgbgd94il12qik8b51-etc
  /nix/store/9m1ya6j8rg3lifhsggzxkdizq7yi8k75-nixos-system-server-test
  /nix/store/jsp1lnd9gc5xxfd5xr7xn297b9grv94l-nixos-system-server-test