[MacPorts] #56944: Error: Failed to build ld64-127: command execution failed

[MacPorts]

#56944: Error: Failed to build ld64-127: command execution failed
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  Reporter:  mrkapqa   |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.3
Resolution:            |   Keywords:
      Port:  ld64-127  |
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Comment (by kencu):

 So this looks like it happens during a `rev-upgrade` for some reason. Can
 you tell me (or show me) what happenned just before this, to trigger that
 `rev-upgrade` event?

 Usually something would have been installed, then some inconsistency found
 (like a `stdlib` mismatch for example) to trigger the rebuild.

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Ticket URL: <https://trac.macports.org/ticket/56944#comment:3>
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