[MacPorts] #70811: libvpx @1.13.1_0 build failure: 'string' file not found

[MacPorts]

#70811: libvpx @1.13.1_0 build failure: 'string' file not found
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  Reporter:  amadeus24  |      Owner:  mascguy
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  libvpx     |
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Comment (by kencu):

 can you show us the outcome of this please?

 {{{
 ls -la /Library/Developer/CommandLineTools/usr/include/c++
 }}}

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Ticket URL: <https://trac.macports.org/ticket/70811#comment:2>
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