[MacPorts] #61509: jbig2dec fails to build on macOS 11.0 (Big Sur)

[MacPorts]

#61509: jbig2dec fails to build on macOS 11.0 (Big Sur)
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  Reporter:  moyang    |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:  bigsur
      Port:  jbig2dec  |
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Comment (by moyang):

 Replying to [comment:2 ryandesign]:
 > Sounds like you have not updated Xcode to 12.2 or have not updated Xcode
 command line tools to 12.2. Please do that.

 I am sure my Xcode version is 12.2 and the command line tools are updated.

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Ticket URL: <https://trac.macports.org/ticket/61509#comment:3>
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