[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):

 The build also fails on Catalina with the same error as El Capitan.

 I don't see the port maintainer knowingly releasing a broken port, so
 there is something odd going on here. But what?

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Ticket URL: <https://trac.macports.org/ticket/62123#comment:2>
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