[MacPorts] #62822: gmake 4.3_0+universal: build error on BigSur arm64

[MacPorts]

#62822: gmake 4.3_0+universal: build error on BigSur arm64
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  Reporter:  kode54  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:  gmake   |
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Comment (by kode54):

 /Library/Developer/CommandLineTools/SDKs contains a MacOS11.3.sdk. Though
 I have xcode-select configured to use Xcode 12.5, not the Command Line
 Tools. I also have Xcode located on an external Thunderbolt drive.

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Ticket URL: <https://trac.macports.org/ticket/62822#comment:4>
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