[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:  High       |  Milestone:  MacPorts 2.7.0
 Component:  ports      |    Version:  2.6.1
Resolution:             |   Keywords:  bug
      Port:  clang-9.0  |
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Changes (by jerryzj):

 * Attachment "截圖 2019-10-10 19.53.11.png" added.

 screenshot of this error

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