[MacPorts] #61483: neon @0.30.2 does not build on Big Sur (11.0.1)

[MacPorts]

#61483: neon    @0.30.2 does not build on Big Sur (11.0.1)
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  Reporter:  AP1010  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.4
Resolution:          |   Keywords:
      Port:  neon    |
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Comment (by Tatsh):

 Replying to [comment:4 AP1010]:
 > Indeed, it does seem to be the "implicit declaration invalid in C99
 issue". The port builds with configure.compiler=macports-clang-9.0

 Also works with `macports-clang-11`.

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Ticket URL: <https://trac.macports.org/ticket/61483#comment:5>
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