opencv-4.5.4 enable_cvv fixes #3063

[sergiomb2]

The cvv module is compiled conditionally on HAVE_QT5. But in opencv commit 87d4970 this variable was renamed to HAVE_QT, so the module is never compiled.

fixes #3063

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See details at https://github.com/opencv/opencv/wiki/How_to_contribute#making-a-good-pull-request

• I agree to contribute to the project under Apache 2 License.
• To the best of my knowledge, the proposed patch is not based on a code under GPL or other license that is incompatible with OpenCV
• The PR is proposed to proper branch
• There is reference to original bug report and related work
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  Patch to opencv_extra has the same branch name.
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buildworker:Custom=linux-1,linux-4,linux-6
build_image:Custom=qt:16.04

[antonio-rojas]

Note that HAVE_QT can mean Qt 4, 5 or 6. So you need to check that the found Qt version is actually compatible with cvv code.

[mshabunin]

I agree, QT_VERSION_MAJOR EQUAL 5 check should be added.

[alalek]

Thank you for contribution!

This patch should go into 3.4 branch first.
We will merge changes from 3.4 into master regularly (weekly/bi-weekly).

Please:

• change "base" branch of this PR: master => 3.4 (use "Edit" button near PR title)
• rebase your commits from master onto 3.4 branch. For example:
  git rebase -i --onto upstream/3.4 upstream/master
  (check list of your commits, save and quit (Esc + "wq" + Enter)
  where upstream is configured by following this GitHub guide and fetched (git fetch upstream).
• push rebased commits into source branch of your fork (with --force option)

Note: no needs to re-open PR, apply changes "inplace".

[sergiomb2]

I agree, QT_VERSION_MAJOR EQUAL 5 check should be added.

and for QT6, can we enable it ? or is known that is not working for QT6 and we also should disable it ?

[sergiomb2]

Thank you for contribution!

This patch should go into 3.4 branch first. We will merge changes from 3.4 into master regularly (weekly/bi-weekly).

Please:

* change "base" branch of this PR: master => 3.4 (use "Edit" button near PR title)

* rebase your commits from master onto 3.4 branch. For example:
  `git rebase -i --onto upstream/3.4 upstream/master`
  (check list of your commits, save and quit (Esc + "wq" + Enter)
  where `upstream` is configured by following [this GitHub guide](https://help.github.com/articles/configuring-a-remote-for-a-fork/) and fetched (`git fetch upstream`).

* push rebased commits into source branch of your fork (with `--force` option)

Note: no needs to re-open PR, apply changes "inplace".

done, I propose add if not HAVE_QT OR QT_VERSION_MAJOR LESS 5 , disable it, allowing build on QT6 !

[alalek]

Well done! Thank you 👍