[MacPorts] #43978: libgcc: error: unknown value '10.10' of -mmacosx-version-min

[MacPorts]

#43978: libgcc: error: unknown value '10.10' of -mmacosx-version-min
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  Reporter:  arthur@…  |      Owner:  mww@…
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.0
Resolution:            |   Keywords:  yosemite
      Port:  libgcc    |
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Comment (by macports_org@…):

 Am finding I cannot install octave because the same issue is occurring for
 gcc47.

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Ticket URL: <https://trac.macports.org/ticket/43978#comment:22>
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