[MacPorts] #70749: re2c @3.1: Build error: headers not found on macOS Sequoia

[MacPorts]

#70749: re2c @3.1: Build error: headers not found on macOS Sequoia
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  Reporter:  wwalexander  |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.10.1
Resolution:               |   Keywords:  sequoia
      Port:               |
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Comment (by ryandesign):

 An inability to find system headers seems to be a problem affecting many
 ports on macOS 15 and/or Xcode 16; see #70750.

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Ticket URL: <https://trac.macports.org/ticket/70749#comment:3>
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