[MacPorts] #65337: openmpi @4.1.4: subports openmpi-gcc7 and openmpi-gcc9: builds failing for 10.7 and earlier

[MacPorts]

#65337: openmpi @4.1.4: subports openmpi-gcc7 and openmpi-gcc9: builds failing for
10.7 and earlier
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  Reporter:  mascguy                    |      Owner:  mascguy
      Type:  defect                     |     Status:  assigned
  Priority:  Normal                     |  Milestone:
 Component:  ports                      |    Version:  2.7.2
Resolution:                             |   Keywords:
      Port:  openmpi-gcc7 openmpi-gcc9  |
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Comment (by cjones051073):

 please attach here, if you can, the conftest.c referred to above

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Ticket URL: <https://trac.macports.org/ticket/65337#comment:3>
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