[MacPorts] #48074: auto-multiple-choice: AMC-detect fails to build after update to opencv 3.0.0

[MacPorts]

#48074: auto-multiple-choice: AMC-detect fails to build after update to opencv
3.0.0
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  Reporter:  devans@…              |      Owner:  joel.brogniart@…
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.3.3
Resolution:                        |   Keywords:
      Port:  auto-multiple-choice  |
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Comment (by devans@…):

 For the purposes of MacPorts alone, this would probably OK, since the 2.4
 version is no longer available as a port.  However, a more rigorous
 approach would be to test (perhaps using pkg-config) which version is
 installed and modify the code to behave according based on the result.

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Ticket URL: <https://trac.macports.org/ticket/48074#comment:2>
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