[MacPorts] #37847: graphviz +ming: build failure due to missing include

[MacPorts]

#37847: graphviz +ming: build failure due to missing include
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  Reporter:  david@…   |      Owner:  ryandesign@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.1.2
Resolution:            |   Keywords:
      Port:  graphviz  |
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Comment (by david@…):

 Just added a Portfile diff to fix this problem.

 Please integrate this so the +ming variant can compile.

 Thanks.

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Ticket URL: <https://trac.macports.org/ticket/37847#comment:4>
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