[MacPorts] #61515: Brew zsh hangs on $(...) command substitution in Big Sur 11.0.1

[MacPorts]

#61515: Brew zsh hangs on $(...) command substitution in Big Sur 11.0.1
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  Reporter:  joelburton  |      Owner:  larryv
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.4
Resolution:              |   Keywords:  bigsur
      Port:  zsh         |
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Comment (by ryandesign):

 Per [https://github.com/Homebrew/homebrew-core/pull/64923/files the fix
 that Homebrew committed], it was a problem with implicit function
 declarations: a common problem we are seeing with many, many ports under
 Xcode 12. Whereas Homebrew chose to downgrade the error to a warning, the
 correct fix is to include the right headers so that the function
 declarations are provided. Not doing so can spell trouble for Apple
 Silicon systems.

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Ticket URL: <https://trac.macports.org/ticket/61515#comment:2>
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