[MacPorts] #67320: clang-11 @11.1.0_7 +universal fails to build when libxslt -universal is active

[MacPorts]

#67320: clang-11 @11.1.0_7 +universal fails to build when libxslt -universal is
active
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  Reporter:  fhgwright  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.8.1
Resolution:             |   Keywords:
      Port:  clang-11   |
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Comment (by kencu):

 that is one weird bug… I still don’t quite follow the issue exactly:

 “ It's the use of -L/opt/local/lib that is causing ld to resolve the
 /usr/lib/libstdc++.6.dylib link in an existing library to
 /opt/local/lib/libstdc++.6.dylib in much the same way that
 DYLD_LIBRARY_PATH operates at runtime for dyld.”

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Ticket URL: <https://trac.macports.org/ticket/67320#comment:9>
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