these 4 derivations will be built:
  /nix/store/b0pck6rhchmbqmvdxvpds9jyfa4k2qf3-uci.json.drv
  /nix/store/5qsdsayvrnibxl94nrk0kbnckfhaywq9-src.drv
  /nix/store/nva71lgi0cha827qv2ndfbccki4s5g2j-nix-uci-0.0.1.drv
  /nix/store/5q3v9c4fc7ssn6496ajxwxj3pxf5cb1w-uci-commands.drv
building '/nix/store/5qsdsayvrnibxl94nrk0kbnckfhaywq9-src.drv' on 'ssh-ng://customer@mac02'
building '/nix/store/5qsdsayvrnibxl94nrk0kbnckfhaywq9-src.drv'