[MacPorts] #62123: bind9 @9.16.11 compile errors on Big Sur and El Capitan

[MacPorts]

#62123: bind9 @9.16.11 compile errors on Big Sur and El Capitan
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  Reporter:  snowflake  |      Owner:  danielluke
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.99
Resolution:             |   Keywords:
      Port:  bind9      |
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Comment (by snowflake):

 This is weird. The buildbots for today (2021-01-22) show the build
 succeeding on 11_arm64. It hasn't yet got to Big Sur Intel or El Capitan
 builds.  Perhaps there is some corruption in my local source files?

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Ticket URL: <https://trac.macports.org/ticket/62123#comment:1>
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