[MacPorts] #53437: gr-osmosdr port install fails re: SoapySDR

[MacPorts]

#53437: gr-osmosdr port install fails re: SoapySDR
-------------------------+-------------------
  Reporter:  xlf99       |      Owner:
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.4.0
Resolution:              |   Keywords:
      Port:  gr-osmosdr  |
-------------------------+-------------------

Comment (by kencu):

 error is:
 {{{
 fatal error: 'mutex' file not found
 }}}
 so, looks like SoapySDR needs
 {{{
 -std=c++11 -stdlib=libc++
 }}}
 i.e. the cxx11 portgroup

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Ticket URL: <https://trac.macports.org/ticket/53437#comment:1>
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