Group is
  $/smlnj-lib.cm
  $/basis.cm
  ../common/sources.cm
  IntMap.sml
  IntSet.sml
  PICKLESIG.sig
  BASEPICKLESIG.sig
  CODEC.sig
  BytePickle.sml
  BitPickle.sml
  PickleFun.sml
  BasePickleFun.sml
  Pickle.sml
