[MacPorts] #71522: bind9 @9.20.4 did not build with system compiler on macOS 10.11.6

[MacPorts]

#71522: bind9 @9.20.4 did not build with system compiler on macOS 10.11.6
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  Reporter:  snowflake  |      Owner:  danielluke
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.10.99
Resolution:             |   Keywords:
      Port:  bind9      |
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Comment (by danielluke):

 Could you upload the failed build log please? (I suspect the atomics patch
 needs to be updated/reintroduced but upstream changed enough that I didn’t
 see where it is needed and I don’t have an older system to test on).

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Ticket URL: <https://trac.macports.org/ticket/71522#comment:1>
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