[MacPorts] #54993: Processing of port openmpi-gcc7 failed

[MacPorts]

#54993: Processing of port openmpi-gcc7 failed
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  Reporter:  ogourgue      |      Owner:  seanfarley
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:  highsierra
      Port:  openmpi-gcc7  |
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Comment (by Athius):

 I just find a fix using the gcc option -mmacosx-version-min=10.12 (from
 https://discussions.apple.com/thread/8127677)

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Ticket URL: <https://trac.macports.org/ticket/54993#comment:26>
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