anchor.diff:      "--with-storage-zfs"
     ] ++ optionals enableIscsi [
       "--with-storage-iscsi"
  +  ] ++ optionals enableCeph [
  +    "--with-storage-rbd"
     ] ++ optionals stdenv.isDarwin [
       "--with-init-script=none"
     ];
  
positive.code:     xen
    ] ++ optionals enableIscsi [
      openiscsi
    ] ++ optionals stdenv.isDarwin [
      libiconv gmp
    ];
  
negative.code: , curl, libiconv, gmp, zfs, parted, bridge-utils, dmidecode
  , enableXen ? false, xen ? null
  , enableIscsi ? false, openiscsi
  , enableCeph ? false, ceph
  }:
  
  with stdenv.lib;
  