[MacPorts] #61949: graphviz fails to build on Catalina

[MacPorts]

#61949: graphviz fails to build on Catalina
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  Reporter:  cwgamma  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  High     |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:           |
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Changes (by cwgamma):

 * Attachment "graphviz_main.log" added.

 build log file

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Ticket URL: <https://trac.macports.org/ticket/61949>
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