[MacPorts] #35667: arm-elf-gcc fails to build when libunwind-headers is installed

[MacPorts]

#35667: arm-elf-gcc fails to build when libunwind-headers is installed
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  Reporter:  dirkx@…      |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.2
Resolution:               |   Keywords:
      Port:  arm-elf-gcc  |
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Comment (by egall@…):

 The CarbonHeaders port introduced in r104661 includes an `Availability.h`
 header; does using that with libunwind-headers work?

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Ticket URL: <https://trac.macports.org/ticket/35667#comment:4>
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