[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 danielluke):

 Thanks for the confirmation - I should be able to replicate the problem
 and patch the build to work around this (also, once the archives are
 available, most people won't notice as they'll just get those binaries
 instead).

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Ticket URL: <https://trac.macports.org/ticket/62123#comment:12>
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