[MacPorts] #56603: zstd: error: expected ')'

[MacPorts]

#56603: zstd: error: expected ')'
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  Reporter:  kencu   |      Owner:  seanfarley
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  zstd    |
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Comment (by ryandesign):

 The `-stdlib=...` flag is in `configure.cxxflags`. The port just needs to
 use it.

 Instead of making a new variable `extraflags`, it seems like it would be
 easier to just append the needed flag(s) to `configure.cflags` and/or
 `configure.cxxflags` (when needed) since those are (or will be) used
 already.

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Ticket URL: <https://trac.macports.org/ticket/56603#comment:5>
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