[MacPorts] #61216: Virtuoso-7 fail to install on OS 10.15 with XCode 12.0

[MacPorts]

#61216: Virtuoso-7 fail to install on OS 10.15 with XCode 12.0
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  Reporter:  JacquesLB   |      Owner:  nerdling
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.3
Resolution:              |   Keywords:  xcode12
      Port:  virtuoso-7  |
-------------------------+----------------------

Comment (by steb5067):

 virtuoso-7 is also a dependency for digikam.
 exactly the same problem noted as Jacques when trying to install digikam.
 trying the port clean, port install -t trick, but not expecting any luck.

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Ticket URL: <https://trac.macports.org/ticket/61216#comment:17>
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