[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    |
---------------------+--------------------

Comment (by jungx098):

 The root cause is that clang 12 enables `-Werror` by default. Not sure if
 Apple will roll back this feature.

 One workaround is to add `-Wno-error=all` to `CFLAGS`.

 I made a quick patch: https://github.com/macports/macports-
 ports/compare/master...jungx098:neon

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Ticket URL: <https://trac.macports.org/ticket/61483#comment:8>
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