[MacPorts] #61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2

[MacPorts]

#61477: clang-9.0 fails to build on Big Sur macOS 11.0.1 Xcode 12.2
------------------------+----------------------
  Reporter:  jhoyt4     |      Owner:  kencu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  clang-9.0  |
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Comment (by kencu):

 hmm. Looks like this did it:
 {{{
                 # qdoc now uses libclang for parsing C/C++ code
                 # see https://wiki.qt.io/New_Features_in_Qt_5.11
                 configure.env-append
 LLVM_INSTALL_DIR=${prefix}/libexec/llvm-9.0
 }}}

 and so the dep on clang-9.0 was added.

 Well -- I wonder if that is still needed. That is a fairly old addition.

 The mainstream qt5 installer does not require all users to install
 clang/llvm-9.0 outside MacPorts. So that is open for review I guess, but
 not today.

-- 
Ticket URL: <https://trac.macports.org/ticket/61477#comment:7>
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