[MacPorts] #70716: Unable to install on MacOSx 10.15 (Sequoia)

[MacPorts]

#70716: Unable to install on MacOSx 10.15 (Sequoia)
---------------------+-----------------------------
 Reporter:  cemb007  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  cmake-bootstrap
---------------------+-----------------------------
 Running on 10.15 (24A335), I installed the latest RC 16 Xcode from Apple
 and then reinstalled MacPorts (2.10.1, from source).  When I try to
 install cmake-bootstrap (among a few others as this is a dependency), I
 receive the following:
 :info:configure CMake 3.9.6, Copyright 2000-2017 Kitware, Inc. and
 Contributors
 :info:configure C compiler on this system is: /usr/bin/clang -pipe -Os
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX15.sdk -arch
 x86_64 -std=gnu11
 :info:configure ---------------------------------------------
 :info:configure Error when bootstrapping CMake:
 :info:configure Cannot find appropriate C++ compiler on this system.
 :info:configure Please specify one using environment variable CXX.

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Ticket URL: <https://trac.macports.org/ticket/70716>
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