sorted_index_files`
    for f in $xref_files_new $secondary_xref_files ; do
      if test -f "$rel$in_dir/$f" ; then
        remove $rel$in_dir/$f
      fi
    done
  fi
}


# xref_files_changed - Return success if the xref files have changed
# since the previous run.
xref_files_changed ()
{
  xref_files_new=`generated_files_get`

  # LaTeX (and the package changebar) report in the LOG file if it
  # should be rerun.  This is needed for files included from
  # subdirs, since texi2dvi does not try to compare xref files in
  # subdirs.  Performing xref files test is still good since LaTeX
  # does not report changes in xref files.
  if grep "Rerun to get" "$in_noext.log" >&6 2>&1; then
    return 0
  fi
  # Similarly, check for biblatex report of whether rerunning is needed.
  if grep "biblatex.*(re)run" "$in_noext.log" >&6 2>&1; then
    return 0
  fi

  # If old and new lists don't have the same file list,
  # then something has definitely changed.
  verbose "Original xref files = $xref_files_orig"
  verbose "New xref files      = $xref_files_new"
  if test "x$xref_files_orig" != "x$xref_files_new"; then
    return 0
  fi

  # Compare each file until we find a difference.
  for this_file in $xref_files_new; do
    verbose "Comparing xref file `echo $this_file | $SED 's|\./||g'` ..."
    # cmp -s returns nonzero exit status if files differ.
    if cmp -s "$this_file" "$rel$work_bak/$this_file"; then :; else
      verbose "xref file `echo $this_file | $SED 's|\./||g'` differed ..."
      if $debug; then
        diff -u "$rel$work_bak/$this_file" "$this_file"
      fi
      return 0
    fi
  done

  secondary_xref_files=`sorted_index_files`
  verbose "Secondary xref files = $secondary_xref_files"
  for this_file in $secondary_xref_files; do
    if test -f $this_file; then :; else
      verbose "$this_file missing ..."
      return 0
    fi
  done

  # No change.
  return 1
}

#