[MacPorts] #59243: clang-9.0 dependency error in macOS 10.15

[MacPorts]

#59243: clang-9.0 dependency error in macOS 10.15
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  Reporter:  jerryzj    |      Owner:  jeremyhu
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.1
Resolution:             |   Keywords:
      Port:  clang-9.0  |
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Comment (by jerryzj):

 Yeah, but in my experience (build clang+llvm 9.0 on Linux), we only need
 CMake, gcc(base on the release, can be 7 to 9) and python to build it.
 I think MacPorts make things too complicated :(

 BTW, if I already have CMake installed, why MacPorts still build its own
 CMake in /opt/local/bin
 I don't really understand the logic behind this approach...

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Ticket URL: <https://trac.macports.org/ticket/59243#comment:6>
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