[MacPorts] #56519: libcxx database corrupted, universal broken, weird circular dependency

[MacPorts]

#56519: libcxx database corrupted, universal broken, weird circular dependency
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  Reporter:  gaming-hacker  |      Owner:  (none)
      Type:  defect         |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.4.3
Resolution:                 |   Keywords:  libxml2, universal, ghostscript
      Port:  libcxx         |
----------------------------+---------------------------------------------

Comment (by kencu):

 why are you trying to install libcxx @6 ??

 That PR is just in the "take a look" phase, and may never be
 committed....how did you get at it?

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Ticket URL: <https://trac.macports.org/ticket/56519#comment:2>
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