[MacPorts] #59616: py37-numpy: Symbol not found: _environ, Referenced from: libgfortran.5.dylib, Expected in: flat namespace

[MacPorts]

#59616: py37-numpy: Symbol not found: _environ, Referenced from:
libgfortran.5.dylib, Expected in: flat namespace
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  py-numpy    |
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Comment (by ryandesign):

 We did just do the libc++ switchover for 10.6-10.8. We did purge all the
 old archives that linked with /usr/lib/libstdc++.dylib so that they could
 be rebuilt with libc++. But it is possible that this is somehow related to
 that, and that we missed purging some archives that needed to be. (For
 example, we initially missed the ports that used the cxx11 1.1 portgroup,
 but have subsequently purged them as well.) If you can identify other
 archives that need purging let me know.

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Ticket URL: <https://trac.macports.org/ticket/59616#comment:1>
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