[MacPorts] #61262: ImageMagick @6.9.11-31: build fails using Xcode 12.0.1 (implicit-function-declaration)

[MacPorts]

#61262: ImageMagick @6.9.11-31: build fails using Xcode 12.0.1 (implicit-function-
declaration)
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  Reporter:  dbevans      |      Owner:  ryandesign
      Type:  defect       |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  ImageMagick  |
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Comment (by chrstphrchvz):

 There is recent upstream work addressing this: see
 https://github.com/ImageMagick/ImageMagick6/commit/3417f41c34 and
 https://github.com/ImageMagick/ImageMagick6/commit/6ecb84f400.

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Ticket URL: <https://trac.macports.org/ticket/61262#comment:1>
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