[MacPorts] #59620: zstd does need a newer compiler than stock 10.5 supplied

[MacPorts]

#59620: zstd does need a newer compiler than stock 10.5 supplied
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 Reporter:  rmottola  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  leopard   |       Port:  zstd
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 Compiling zstd on Leopard i386 barfs because it uses gcc-4.2, it is too
 old.

 Just forcing gcc 6 fixed the issue.

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Ticket URL: <https://trac.macports.org/ticket/59620>
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