[MacPorts] #59807: libcxx needs a method to bootstrap to the +emulated_tls variant

[MacPorts]

#59807: libcxx needs a method to bootstrap to the +emulated_tls variant
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  Reporter:  fvaccari  |      Owner:  jeremyhu
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:  snowleopard
      Port:  libcxx    |
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Comment (by kencu):

 and this is a duplicate of another ticket that also has outlined this
 issue, although you couldn't possibly know that as the person who ran
 across the issue trying to install gdal....

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Ticket URL: <https://trac.macports.org/ticket/59807#comment:5>
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