[MacPorts] #36687: Error: org.macports.build for port graphviz returned: command execution failed

[MacPorts]

#36687: Error: org.macports.build for port graphviz returned: command execution
failed
----------------------------------+--------------------------
  Reporter:  jacopo.lanzoni.10@…  |      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 ryandesign@…):

 Thanks. Could you also attach the output of:

 {{{
 port -v installed
 }}}

 It builds fine for me, so I need to try to find some difference between
 your system and mine.

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Ticket URL: <https://trac.macports.org/ticket/36687#comment:5>
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