[MacPorts] #52002: lilypond build fails due to missing reference to libc++ on some Darwin systems - fix attached

[MacPorts]

#52002: lilypond build fails due to missing reference to libc++ on some Darwin
systems - fix attached
-------------------------------------+--------------------
  Reporter:  kenneth.f.cunningham@…  |      Owner:  snc@…
      Type:  defect                  |     Status:  closed
  Priority:  Normal                  |  Milestone:
 Component:  ports                   |    Version:  2.3.4
Resolution:  fixed                   |   Keywords:
      Port:  lilypond                |
-------------------------------------+--------------------

Comment (by kenneth.f.cunningham@…):

 Replying to [comment:7 ryandesign@…]:
 > libc++ isn't the default C++ library on Snow Leopard.

 The crux of the issue. Much current software will assume libc++ is the
 default, and not specifically link it.

 I wonder if this can be changed somewhere in the guts of the clang-3.7
 linker scripts where mortals should not venture...

 > The other system where it worked was also using Snow Leopard?

 No - one of my El Cap machines.

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Ticket URL: <https://trac.macports.org/ticket/52002#comment:8>
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