[MacPorts] #61879: Add clang11 sub-port to openmpi

[MacPorts]

#61879: Add clang11 sub-port to openmpi
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  Reporter:  aivazis      |      Owner:  mascguy
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  openmpi      |
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Comment (by mascguy):

 While the portfile minutia might be trivial (assuming no clang11-specific
 issues, that is)... it occurred to me: Will we need a `gcc11` port to
 build this?

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Ticket URL: <https://trac.macports.org/ticket/61879#comment:6>
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