[MacPorts] #58516: volk-gnss-sdr @0.0.10: error: invalid value 'c++14' in '-std=c++14'

[MacPorts]

#58516: volk-gnss-sdr @0.0.10: error: invalid value 'c++14' in '-std=c++14'
------------------------+---------------------------
 Reporter:  ryandesign  |      Owner:  michaelld
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  volk-gnss-sdr
------------------------+---------------------------
 [https://build.macports.org/builders/ports-10.9_x86_64-builder/builds/89335/steps
 /install-port/logs/stdio Build fails]:

 {{{
 error: invalid value 'c++14' in '-std=c++14'
 }}}

 In addition to the cxx11 1.1 portgroup, you need to use `compiler
 .blacklist-append {clang < 602}` for C++14 support.

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Ticket URL: <https://trac.macports.org/ticket/58516>
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