[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  |
--------------------------+----------------------

Comment (by ddennedy):

 Replying to [comment:15 RJVB]:
 > The stdlib part is not dependent on the compiler but on the (Mac) OS
 version.

 libc++ is a part of LLVM, which is no longer bound to OS.

 > 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...

 On my 10.12.6 machine:
 {{{
 ddennedy-macbook:~ ddennedy$ clang++ --version
 Apple LLVM version 9.0.0 (clang-900.0.38)
 Target: x86_64-apple-darwin16.7.0
 }}}
 I have a OS X 10.8-based machine that I use for testing, and it says
 clang-8.... It did not work with the "-std=c++11" option when I added it
 to the Makefile and before I restricted it to gcc. However, it could have
 been that I needed to specify libc++ but did not. I will have to test that
 again.

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Ticket URL: <https://trac.macports.org/ticket/54861#comment:17>
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