[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:
      Port:  virtuoso-7  |
-------------------------+----------------------

Comment (by nerdling):

 Right now, all I have is it builds for me with trace mode enabled. There
 is a build error without trace mode, and I'll need time to dig in and see
 what's being pulled in opportunistically—and make it stop.

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Ticket URL: <https://trac.macports.org/ticket/61216#comment:10>
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