[MacPorts] #66249: graphviz +poppler +r +rsvg on macOS 13.0.01 fails: clang: error: unsupported option '-fopenmp'

[MacPorts]

#66249: graphviz +poppler +r +rsvg  on macOS 13.0.01 fails: clang: error:
unsupported option '-fopenmp'
--------------------------------+------------------------
  Reporter:  captainproton1971  |      Owner:  ryandesign
      Type:  defect             |     Status:  assigned
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.8.0
Resolution:                     |   Keywords:
      Port:  graphviz           |
--------------------------------+------------------------

Comment (by captainproton1971):

 I can confirm that adding {{{compiler.openmp_version 4.0}}} to the
 Portfile results in a completed build (although it does give the following
 warnings that I think are likely unrelated):

 {{{
 Warning: violation by /Library/Python
 Warning: graphviz violates the layout of the ports-filesystems!
 Warning: Please fix or indicate this misbehavior (if it is intended), it
 will be an error in future releases!
 }}}

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Ticket URL: <https://trac.macports.org/ticket/66249#comment:2>
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