[MacPorts] #40807: MacPorts-built `dot` (from graphviz @2.34.0) hangs when generating doxymentation on 10.6

[MacPorts]

#40807: MacPorts-built `dot` (from graphviz @2.34.0) hangs when generating
doxymentation on 10.6
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  Reporter:  egall@…   |      Owner:  macports-tickets@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.2.0
Resolution:            |   Keywords:  snowleopard
      Port:  graphviz  |
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Comment (by ryandesign@…):

 Do you see the same problem with graphviz-devel?

 If so, do you have a simple reproduction recipe—ideally a small dot file
 that can be run with `dot` to demonstrate the problem?

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Ticket URL: <https://trac.macports.org/ticket/40807#comment:3>
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