[MacPorts] #62480: py-numpy: Compiler clang37 not available for Darwin20 arm

[MacPorts]

#62480: py-numpy: Compiler clang37 not available for Darwin20 arm
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  arm64
      Port:  py-numpy    |
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Comment (by jmroot):

 It seems really inconvenient that each port needs to check which platform
 it's on and only ask for compilers that are supported on that platform.
 Couldn't that be handled by the portgroup?

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Ticket URL: <https://trac.macports.org/ticket/62480#comment:3>
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