[MacPorts] #54861: mlt-qt5 install fails with the message "Package Qt5Core was not found in the pkg-config search path."

[MacPorts]

#54861: mlt-qt5 install fails with the message "Package Qt5Core was not found in
the pkg-config search path."
--------------------------+----------------------
  Reporter:  wilya7       |      Owner:  ddennedy
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  mlt mlt-qt5  |
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Comment (by RJVB):

 Replying to [comment:12 wilya7]:
 > I think this patch can be safely applied upstream. Is there a timeline
 to be expected? I would love not have to apply again the patch anytime I
 do a new "port selfupdate". Regardless, thank you for fixing the problem.

 Don't you simply mean shipping the patch with the port so that you don't
 have to apply it yourself?

 The stdlib part is not dependent on the compiler but on the (Mac) OS
 version.

 What clang versions have "clang-9" in their version string? You'd need
 something that accounts for both the stock/official versioning (e.g.
 4.0.1) and Apple's sauce...

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Ticket URL: <https://trac.macports.org/ticket/54861#comment:15>
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