[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
-----------------------+----------------------------
  Reporter:  SaintBol  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:  sequoia sonoma
      Port:            |
-----------------------+----------------------------

Comment (by Iritscen):

 Personally I only have the files…

 {{{

  c++/v1/__functional_03
  c++/v1/__functional_base_03
  c++/v1/__sso_allocator
 }}}


 …in my directory and it's enough to cause the same issue that everyone
 else here is having. About to try wiping and reinstalling the CLT, but I
 made a zip backup of this folder in case it's of interest to anyone.

-- 
Ticket URL: <https://trac.macports.org/ticket/70750#comment:62>
MacPorts <https://www.macports.org/>
Ports system for macOS