[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
 Keywords:                     |       Port:  graphviz
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 Log attached, but the salient point is (I think) {{{:info:build clang:
 error: unsupported option '-fopenmp'}}}

 Seems to be related to (fixed) issue
 https://trac.macports.org/ticket/61327.

 I'll try a similar fix (compiler blacklist) and report back.

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