[MacPorts] #63647: graphviz-gui fails to install because of missing CoreSimulator

[MacPorts]

#63647: graphviz-gui fails to install because of missing CoreSimulator
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  Reporter:  reynoldsnlp   |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.1
Resolution:                |   Keywords:  CoreSimulator
      Port:  graphviz-gui  |
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Comment (by reynoldsnlp):

 I just tried opening XCode and it said that it needed to install certain
 resources before it could run. After it finished, I tried installing again
 and it worked. It would be good if MacPorts could detect such problems and
 give a more meaningful error message.

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Ticket URL: <https://trac.macports.org/ticket/63647#comment:1>
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