[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):

 Now py27-scipy is failing in a really strange and problematic way:
 https://build.macports.org/builders/ports-
 11_arm64-watcher/builds/3877/steps/subports/logs/stdio

 It doesn't fail to mportopen, but then a variable that should always be
 set, isn't.

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Ticket URL: <https://trac.macports.org/ticket/62480#comment:7>
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