[MacPorts] #61752: py38-kiwisolver @1.3.1 does not build on PPC Leopard, Mac OS X 10.5.8, because of unrecognized command line option '-stdlib=libc++'

[MacPorts]

#61752: py38-kiwisolver @1.3.1 does not build on PPC Leopard, Mac OS X 10.5.8,
because of unrecognized command line option '-stdlib=libc++'
------------------------------+------------------------
  Reporter:  ballapete        |      Owner:  reneeotten
      Type:  defect           |     Status:  assigned
  Priority:  Normal           |  Milestone:
 Component:  ports            |    Version:  2.6.4
Resolution:                   |   Keywords:  leopard
      Port:  py38-kiwisolver  |
------------------------------+------------------------

Comment (by ballapete):

 > The port requests {{{compiler.cxx_standard   2011}}} so presumably an
 appropriate compiler should be selected. I don't know why {{{gcc-mp-7}}}
 does not understand the {{{-stdlib=libc++}}} flag.

 Isn't this a `g++` switch? But `gcc` is compiling…

 > Did the previous version (v.1.2.0) work correctly?

 I don't know. I did not try before to get rid of `Python 2.7`. So this
 dependency hit me for the first time – and all need is py38-nltk (which
 can be installed with `pip3` without any dependency).

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Ticket URL: <https://trac.macports.org/ticket/61752#comment:4>
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