[MacPorts] #66331: libgcc9: Error: gcc9 9.5.0 is not supported on Darwin 17 i386

[MacPorts]

#66331: libgcc9: Error: gcc9 9.5.0 is not supported on Darwin 17 i386
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  Reporter:  WolfgangFahl  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  highsierra
      Port:  libgcc9       |
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Comment (by WolfgangFahl):

 port dependents libgcc9
 OpenBLAS depends on libgcc9
 gcc9 depends on libgcc9
 libgcc depends on libgcc9
 libgcc8 depends on libgcc9

 port dependents OpenBLAS
 py27-numpy depends on OpenBLAS
 py310-numpy depends on OpenBLAS
 py37-numpy depends on OpenBLAS

 since numpy is important for me i'd need a HighSierra compatible version
 of it.

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Ticket URL: <https://trac.macports.org/ticket/66331#comment:3>
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