[MacPorts] #70130: zstdConfig.cmake uses Linux flags on some macOS which breaks configure

[MacPorts]

#70130: zstdConfig.cmake uses Linux flags on some macOS which breaks configure
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  Reporter:  barracuda156      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect            |     Status:  assigned
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:  2.9.3
Resolution:                    |   Keywords:
      Port:  zstdConfig.cmake  |
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Comment (by ryandesign):

 Replying to [ticket:70130 barracuda156]:
 > Problem is that CMake uses Linux-specific linker flags,

 Which flag is Linux-specific?

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Ticket URL: <https://trac.macports.org/ticket/70130#comment:1>
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