[MacPorts] #57196: libgcc7 fails to compile/install on macOS Mojave

[MacPorts]

#57196: libgcc7 fails to compile/install on macOS Mojave
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 Reporter:  ProgrammingPoet       |      Owner:  (none)
     Type:  defect                |     Status:  new
 Priority:  Normal                |  Milestone:
Component:  ports                 |    Version:  2.5.3
 Keywords:  libgcc7 install fail  |       Port:  libgcc7, py27-matplotlib
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 Attempting to install libgcc7 as a dependency for matplotlib fails. Log
 file attached.

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Ticket URL: <https://trac.macports.org/ticket/57196>
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