[MacPorts] #60720: llvm-*: checking for existence of /usr/lib/libc++.dylib

[MacPorts]

#60720: llvm-*: checking for existence of /usr/lib/libc++.dylib
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  Reporter:  jmroot                              |      Owner:  jeremyhu
      Type:  defect                              |     Status:  assigned
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:
      Port:  llvm-3.5, llvm-3.7, llvm-5.0,       |
  llvm-6.0, llvm-7.0, llvm-8.0, llvm-9.0,        |
  llvm-10                                        |
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Comment (by jeremyhu):

 I suggest we just do this check on darwin 11 and earlier.

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Ticket URL: <https://trac.macports.org/ticket/60720#comment:5>
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