[MacPorts] #70750: C++ headers are not found after updating to CLTs version 16.0

[MacPorts]

#70750: C++ headers are not found after updating to CLTs version 16.0
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  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia sonoma
      Port:            |
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Comment (by jmroot):

 Replying to [comment:56 shpokas]:
 > Yes, it does work after installing XCode **and uninstalling and
 cleaning** (port uninstall db48 && port clean db48), then installing db48
 again.

 Yeah, you definitely have to clean after making any kind of fix to your
 toolchain, since the configure step could have made any number of wrong
 decisions due to the brokenness.

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Ticket URL: <https://trac.macports.org/ticket/70750#comment:58>
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