[MacPorts] #42348: Latest graphviz with +ming variant build errors

[MacPorts]

#42348: Latest graphviz with +ming variant build errors
---------------------+--------------------------------
 Reporter:  david@…  |      Owner:  macports-tickets@…
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.2.1
 Keywords:           |       Port:  graphviz
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 See attached log.

 gvrender_ming.c:45:15: warning: unused variable 'action' [-Wunused-
 variable]

 Workaround is to build without +ming variant.

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Ticket URL: <https://trac.macports.org/ticket/42348>
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