[MacPorts] #61636: OpenBLAS @0.3.12-universal: Dependencies fail to install on ARM64

[MacPorts]

#61636: OpenBLAS @0.3.12-universal: Dependencies fail to install on ARM64
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  Reporter:  jpanetta  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  arm64, M1, icu, universal
      Port:  OpenBLAS  |
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Comment (by jpanetta):

 Thanks, I wasn't aware of that. `sudo port install ld64` does not select
 the `+ld64_xcode` variant for me, but rather tries to install
 `ld64-latest`, hence my efforts to get that building.

 Thanks for the information on gcc10!

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Ticket URL: <https://trac.macports.org/ticket/61636#comment:17>
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