[MacPorts] #64353: opencv3 has undocumented dependencies

[MacPorts]

#64353: opencv3 has undocumented dependencies
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  Reporter:  mouse07410  |      Owner:  mascguy
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  opencv3     |
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Comment (by reneeotten):

 Replying to [comment:12 mouse07410]:

 > And the reason that dependency does not show on __my__ machines?
 >
 > {{{
 > $ port installed opencv3
 > The following ports are currently installed:
 >   opencv3 @3.4.16_1+avx2+contrib+java+nonfree+opencl+openmp+qt5+vtk
 (active)
 > $ port deps opencv3
 > Full Name: opencv3 @3.4.16_1
 > Build Dependencies:   cmake, pkgconfig
 > Library Dependencies: ffmpeg, zlib, bzip2, libpng, libjpeg-turbo,
 openjpeg, tiff, webp, ilmbase, openexr
 > $
 > }}}

 that's because you've installed `opencv3` with non-default variants but
 are asking only for the dependencies of the port with its default
 variants. You have to specify the same variants with `port deps` as you've
 used with `port install` to get an accurate list of the dependencies as
 Joshua showed.

 > My objection was not that it was __using__ Macports clang (though there
 doesn't seem much sense in doing that, having Xcode clang around) - but
 that it (a) did not document it (at least on my system), and (b)
 downloaded an old version of clang.

 Xcode clang versions do not support `openmp`, if you remove that variant
 from the `opencv3` port it will likely not install a MacPorts' version of
 clang anymore.

-- 
Ticket URL: <https://trac.macports.org/ticket/64353#comment:13>
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