[MacPorts] #63256: libftdi1 @1.5_1 configure failure: CMake Error: Unknown argument -stdlib=libc++

[MacPorts]

#63256: libftdi1 @1.5_1 configure failure: CMake Error: Unknown argument
-stdlib=libc++
-----------------------+----------------------
  Reporter:  gbudny    |      Owner:  nerdling
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.7.99
Resolution:            |   Keywords:
      Port:  libftdi1  |
-----------------------+----------------------

Comment (by jmroot):

 Looks like `configure.cxxflags` (and also `configure.cflags`) isn't quoted
 properly when used in `configure.args`.

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Ticket URL: <https://trac.macports.org/ticket/63256#comment:2>
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