these 2 derivations will be built:
  /nix/store/swnwq7w4ncf0jigfw3rmvq327784sn2c-TOSHIBA_ColorMFP_CUPS.tar.drv
  /nix/store/b7byvpb77nignk0ybha01n1lnxzwy6gb-cups-toshiba-estudio-7.89.drv