gvpack: option -- unrecognized
Usage: gvpack [-gnuv?] [-m<margin>] {-array[_rc][n]] [-o<outf>] <files>
  -n          - use node granularity
  -g          - use graph granularity
  -array*     - pack as array of graphs
  -G<n>=<v>   - attach name/value attribute to output graph
  -m<n>       - set margin to <n> points
  -s<gname>   - use <gname> for name of root graph
  -o<outfile> - write output to <outfile>
  -u          - no packing; just combine graphs
  -v          - verbose
  -?          - print usage
If no files are specified, stdin is used