[MacPorts] #56634: Recommendation on opencv installation

[MacPorts]

#56634: Recommendation on opencv installation
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 Reporter:  meghadri               |      Owner:  (none)
     Type:  request                |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.5.2
 Keywords:  opencv build protobuf  |       Port:  opencv 3.4.1
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 This is for opencv 3.4.1_2.

 I had protobuf 2.6.1 installed, which turned out to be the cause of errors
 with misleading error messages (permission failures on the file system).
 It turned out that protobuf 3.x was required.

 Deactivating protobuf 2.6.1 and installing 3.5.1 fixed the problem.
 Fortunately in a previous life I have done enough C/C++ programming to be
 able to identify the issue. The same cannot be said for the devs of my
 client, who would have likely struggled with the installation.

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Ticket URL: <https://trac.macports.org/ticket/56634>
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