Comment on attachment 116471 [details]
full digikam r41326 compilation with opencv 4

>-- The C compiler identification is GNU 8.2.1
>-- The CXX compiler identification is GNU 8.2.1
>-- Check for working C compiler: /usr/bin/cc
>-- Check for working C compiler: /usr/bin/cc -- works
>-- Detecting C compiler ABI info
>-- Detecting C compiler ABI info - done
>-- Detecting C compile features
>-- Detecting C compile features - done
>-- Check for working CXX compiler: /usr/bin/c++
>-- Check for working CXX compiler: /usr/bin/c++ -- works
>-- Detecting CXX compiler ABI info
>-- Detecting CXX compiler ABI info - done
>-- Detecting CXX compile features
>-- Detecting CXX compile features - done
>-- ----------------------------------------------------------------------------------
>-- Starting CMake configuration for: digikam-software-collection
>CMake Deprecation Warning at /usr/share/ECM/kde-modules/KDEInstallDirs.cmake:343 (message):
>  LIB_INSTALL_DIR is deprecated, use KDE_INSTALL_LIBDIR instead.
>Call Stack (most recent call first):
>  /usr/share/ECM/kde-modules/KDEInstallDirs.cmake:437 (_define_relative)
>  CMakeLists.txt:27 (include)
>
>
>-- Looking for __GLIBC__
>-- Looking for __GLIBC__ - found
>-- Performing Test _OFFT_IS_64BIT
>-- Performing Test _OFFT_IS_64BIT - Success
>-- Performing Test HAVE_DATE_TIME
>-- Performing Test HAVE_DATE_TIME - Success
>-- Application translations directory is missing. Compilation of application translations is disabled...
>-- You can use DIGIKAMSC_CHECKOUT_PO option to extract GUI i18n files from git repositories.
>-- Main one documentation directory is missing. Compilation of documentation is disabled...
>-- Documentation translations directory is missing.
>-- You can use DIGIKAMSC_CHECKOUT_DOC option to extract doc i18n files from git repositories.
>-- ----------------------------------------------------------------------------------
>-- Compilation configuration for: digikam-software-collection
>-- digiKam core will be compiled.................. YES
>-- Extract application translations files......... NO
>-- Extract documentation translations files....... NO
>-- Translations will be compiled.................. NO
>-- Handbooks will be compiled..................... NO
>-- Tests code will be compiled.................... NO
>-- ----------------------------------------------------------------------------------
>-- Starting CMake configuration for: digikam
>-- Found KF5XmlGui: /usr/lib64/cmake/KF5XmlGui/KF5XmlGuiConfig.cmake (found version "5.52.0") 
>-- Found KF5CoreAddons: /usr/lib64/cmake/KF5CoreAddons/KF5CoreAddonsConfig.cmake (found version "5.52.0") 
>-- Found KF5Config: /usr/lib64/cmake/KF5Config/KF5ConfigConfig.cmake (found version "5.52.0") 
>-- Found KF5Service: /usr/lib64/cmake/KF5Service/KF5ServiceConfig.cmake (found version "5.52.0") 
>-- Found KF5WindowSystem: /usr/lib64/cmake/KF5WindowSystem/KF5WindowSystemConfig.cmake (found version "5.52.0") 
>-- Found KF5Solid: /usr/lib64/cmake/KF5Solid/KF5SolidConfig.cmake (found version "5.52.0") 
>-- Found Gettext: /usr/bin/msgmerge (found version "0.19.8.1") 
>-- Found KF5I18n: /usr/lib64/cmake/KF5I18n/KF5I18nConfig.cmake (found version "5.52.0") 
>-- Found KF5: success (found suitable version "5.52.0", minimum required is "5.1.0") found components:  XmlGui CoreAddons Config Service WindowSystem Solid I18n 
>-- Found KF5KIO: /usr/lib64/cmake/KF5KIO/KF5KIOConfig.cmake (found version "5.52.0") 
>-- Found KF5IconThemes: /usr/lib64/cmake/KF5IconThemes/KF5IconThemesConfig.cmake (found version "5.52.0") 
>-- Found KF5FileMetaData: /usr/lib64/cmake/KF5FileMetaData/KF5FileMetaDataConfig.cmake (found version "5.52.0") 
>-- Found KF5ThreadWeaver: /usr/lib64/cmake/KF5ThreadWeaver/KF5ThreadWeaverConfig.cmake (found version "5.52.0") 
>-- Found KF5NotifyConfig: /usr/lib64/cmake/KF5NotifyConfig/KF5NotifyConfigConfig.cmake (found version "5.52.0") 
>-- Found KF5Notifications: /usr/lib64/cmake/KF5Notifications/KF5NotificationsConfig.cmake (found version "5.52.0") 
>-- Could NOT find KF5AkonadiContact: found neither KF5AkonadiContactConfig.cmake nor kf5akonadicontact-config.cmake 
>-- Could NOT find KF5Sane: found neither KF5SaneConfig.cmake nor kf5sane-config.cmake 
>-- Could NOT find KF5Vkontakte: found neither KF5VkontakteConfig.cmake nor kf5vkontakte-config.cmake 
>-- Found KF5CalendarCore: /usr/lib64/cmake/KF5CalendarCore/KF5CalendarCoreConfig.cmake (found version "5.9.3") 
>-- KF5::KIOWidgets include dirs: /usr/include/KF5/KIOWidgets;/usr/include/KF5
>-- Found JPEG: /usr/lib/libjpeg.so (found version "80") 
>-- Libjpeg version: 84
>-- Using libjpeg sub-directory: libjpeg/84
>-- Found TIFF: /usr/lib/libtiff.so (found version "4.0.10") 
>-- Found ZLIB: /usr/lib/libz.so (found version "1.2.11") 
>-- Found PNG: /usr/lib/libpng.so (found version "1.6.35") 
>-- Boost version: 1.68.0
>-- Found PkgConfig: /usr/bin/pkg-config (found version "1.5.4") 
>-- Checking for module 'lcms2'
>--   Found lcms2, version 2.9
>-- Found lcms version 2.09, /usr/lib/liblcms2.so
>-- Found EXPAT: /usr/lib/libexpat.so (found version "2.2.6") 
>-- Looking for pthread.h
>-- Looking for pthread.h - found
>-- Looking for pthread_create
>-- Looking for pthread_create - not found
>-- Looking for pthread_create in pthreads
>-- Looking for pthread_create in pthreads - not found
>-- Looking for pthread_create in pthread
>-- Looking for pthread_create in pthread - found
>-- Found Threads: TRUE  
>-- Found Exiv2: /usr/lib/libexiv2.so (found suitable version "0.26.0", minimum required is "0.26") 
>-- EXIV2_FOUND       = TRUE
>-- EXIV2_VERSION     = 0.26.0
>-- EXIV2_INCLUDE_DIR = /usr/include
>-- EXIV2_LIBRARY     = /usr/lib/libexiv2.so
>-- EXIV2_DEFINITIONS = 
>-- Checking for module 'libavcodec'
>--   Found libavcodec, version 58.35.100
>-- Checking for module 'libavfilter'
>--   Found libavfilter, version 7.40.101
>-- Checking for module 'libavformat'
>--   Found libavformat, version 58.20.100
>-- Checking for module 'libavdevice'
>--   Found libavdevice, version 58.5.100
>-- Checking for module 'libavutil'
>--   Found libavutil, version 56.22.100
>-- Checking for module 'libswscale'
>--   Found libswscale, version 5.3.100
>-- Checking for module 'libpostproc'
>--   Found libpostproc, version 55.3.100
>-- Found FFmpeg: /usr/lib/libavcodec.so;/usr/lib/libavfilter.so;/usr/lib/libavformat.so;/usr/lib/libavutil.so;/usr/lib/libswscale.so  
>-- FFMPEG_FOUND        = TRUE
>-- FFMPEG_INCLUDE_DIRS = /usr/include
>-- FFMPEG_LIBRARIES    = /usr/lib/libavcodec.so;/usr/lib/libavfilter.so;/usr/lib/libavformat.so;/usr/lib/libavutil.so;/usr/lib/libswscale.so
>-- FFMPEG_DEFINITIONS  = 
>-- QtAV search path: /usr/lib64/cmake
>-- Found QtAV: /usr/lib64/libQtAV.so;/usr/lib64/libQtAVWidgets.so  
>-- Found QtAV version 1.12.0
>-- QtAV_FOUND       = TRUE
>-- QtAV_INCLUDE_DIR = /usr/include/qt/QtAV /usr/include/qt/QtAVWidgets
>-- QtAV_LIBRARIES   = /usr/lib64/libQtAV.so;/usr/lib64/libQtAVWidgets.so
>-- QtAV_VERSION     = 1.12.0
>-- Media player support is enabled.
>-- First try at finding OpenCV...
>-- Found OpenCV: /usr (found version "4.0.0") found components:  core objdetect imgproc imgcodecs 
>-- OpenCV Root directory is: /usr/lib64/cmake/opencv4
>-- OpenCV: Found version 4.0.0 (required: 3.1.0)
>-- OpenCV headers: /usr/include/opencv4
>-- OpenCV libs   : opencv_core;opencv_objdetect;opencv_imgproc;opencv_imgcodecs
>-- Found FLEX: /usr/bin/flex (found version "2.6.4") 
>-- Found BISON: /usr/bin/bison (found version "3.2") 
>-- Found LibXslt: /usr/lib/libxslt.so (found version "1.1.32") 
>-- Found LibXml2: /usr/lib/libxml2.so (found version "2.9.8") 
>-- Could NOT find Marble (missing: MARBLE_INCLUDE_DIR MARBLE_LIBRARIES ASTRO_LIBRARIES) 
>-- Marble_FOUND       = FALSE
>-- MARBLE_INCLUDE_DIR = MARBLE_INCLUDE_DIR-NOTFOUND
>-- MARBLE_LIBRARIES   = MARBLE_LIBRARIES-NOTFOUND
>-- ASTRO_LIBRARIES    = ASTRO_LIBRARIES-NOTFOUND
>-- Found Jasper: /usr/lib/libjasper.so (found version "2.0.14") 
>-- Found Eigen3: /usr/include/eigen3 (Required is at least version "2.91.0") 
>CMake Warning (dev) at /usr/share/cmake-3.12/Modules/FindOpenGL.cmake:270 (message):
>  Policy CMP0072 is not set: FindOpenGL prefers GLVND by default when
>  available.  Run "cmake --help-policy CMP0072" for policy details.  Use the
>  cmake_policy command to set the policy and suppress this warning.
>
>  FindOpenGL found both a legacy GL library:
>
>    OPENGL_gl_LIBRARY: /usr/lib/libGL.so
>
>  and GLVND libraries for OpenGL and GLX:
>
>    OPENGL_opengl_LIBRARY: /usr/lib/libOpenGL.so
>    OPENGL_glx_LIBRARY: /usr/lib/libGLX.so
>
>  OpenGL_GL_PREFERENCE has not been set to "GLVND" or "LEGACY", so for
>  compatibility with CMake 3.10 and below the legacy GL library will be used.
>Call Stack (most recent call first):
>  core/CMakeLists.txt:320 (find_package)
>This warning is for project developers.  Use -Wno-dev to suppress it.
>
>-- Found OpenGL: /usr/lib/libOpenGL.so   
>-- Looking for XOpenDisplay in /usr/lib/libX11.so;/usr/lib/libXext.so
>-- Looking for XOpenDisplay in /usr/lib/libX11.so;/usr/lib/libXext.so - found
>-- Looking for gethostbyname
>-- Looking for gethostbyname - found
>-- Looking for connect
>-- Looking for connect - found
>-- Looking for remove
>-- Looking for remove - found
>-- Looking for shmat
>-- Looking for shmat - found
>-- Looking for IceConnectionNumber in ICE
>-- Looking for IceConnectionNumber in ICE - found
>-- Found X11: /usr/lib/libX11.so
>-- Found Doxygen: /usr/bin/doxygen (found version "1.8.14") found components:  doxygen dot 
>-- Checking for module 'lqr-1'
>--   Found lqr-1, version 0.4.2
>-- Found GLIB2: /usr/lib/libglib-2.0.so  
>-- Performing Test HAVE_LQR_0_4
>-- Performing Test HAVE_LQR_0_4 - Failed
>-- Found Lqr-1: /usr/include/lqr-1;/usr/include/glib-2.0;/usr/lib/glib-2.0/include  
>-- Found Gphoto2: /usr/lib/libgphoto2.so  
>-- libgphoto2 found    : TRUE
>-- libgphoto2 version  : 2.5.19
>-- libgphoto2 includes : /usr/include/gphoto2
>-- libgphoto2 libraries: /usr/lib/libgphoto2.so;/usr/lib/libgphoto2_port.so;/usr/lib/libusb-1.0.so
>-- libgphoto2 API version >= 2.5
>-- Checking for module 'lensfun'
>--   Found lensfun, version 0.3.2.0
>-- Found LensFun: /usr/include/lensfun (found version "0.3.2.0") 
>-- liblensfun: Found version 0.3.2.0 (required: 0.2.6.0)
>-- 
>-- --------------------------------------------------
>-- digiKam RawEngine dependencies checks:
>-- 
>-- RawEngine will be compiled with RedCine codec
>-- Looking for LibJpeg
>-- RawEngine will be compiled with DNG lossy codec
>-- Looking for PThreads
>-- --------------------------------------------------
>-- 
>-- 
>-- ----------------------------------------------------------------------------------
>--  digiKam 6.0.0-beta3 dependencies results   <http://www.digikam.org>
>-- 
>--  MySQL Database Support will be compiled.. YES (optional)
>--  MySQL Internal Support will be compiled.. YES (optional)
>--  DBUS Support will be compiled............ YES (optional)
>--  App. Style Support will be compiled...... YES (optional)
>--  QWebEngine Support will be compiled...... NO  (optional)
>--  libboostgraph found...................... YES
>--  libexiv2 found........................... YES
>--  libexpat found........................... YES
>--  libjpeg found............................ YES
>--  libkde found............................. YES
>--  liblcms found............................ YES
>--  libopencv found.......................... YES
>--  libpng found............................. YES
>--  libpthread found......................... YES
>--  libqt found.............................. YES
>--  libtiff found............................ YES
>--  bison found.............................. YES (optional)
>--  doxygen found............................ YES (optional)
>--  flex found............................... YES (optional)
>--  libakonadicontact found.................. NO  (optional)
>--  digiKam will be compiled without KDE desktop address book support.
>--  Please install the libakonadicontact (version >= 4.89.0) development package.
>-- 
>--  libeigen3 found.......................... YES (optional)
>--  libgphoto2 found......................... YES (optional)
>--  libjasper found.......................... YES (optional)
>--  libkcalcore found........................ YES (optional)
>--  libkvkontakte found...................... NO  (optional)
>--  digiKam will be compiled without libkvkontakte support.
>--  Please install the libkvkontakte (version >= 4.70.0) development package.
>-- 
>--  libkfilemetadata found................... YES (optional)
>--  libkiconthemes found..................... YES (optional)
>--  libkio found............................. YES (optional)
>--  libknotifications found.................. YES (optional)
>--  libknotifyconfig found................... YES (optional)
>--  libksane found........................... NO  (optional)
>--  digiKam will be compiled without flat scanners support.
>--  Please install the libksane (version >= 5.0.0) development package.
>-- 
>--  liblensfun found......................... YES (optional)
>--  liblqr-1 found........................... YES (optional)
>--  libmarble found.......................... NO  (optional)
>--  digiKam will be compiled without geolocation maps support.
>--  Please install the libmarble (version >= 0.22.0) development package.
>-- 
>--  libqtav found............................ YES (optional)
>--  libthreadweaver found.................... YES (optional)
>--  libxml2 found............................ YES (optional)
>--  libxslt found............................ YES (optional)
>--  OpenGL found............................. YES (optional)
>--  digiKam can be compiled.................. YES
>-- ----------------------------------------------------------------------------------
>-- 
>-- Check if the system is big endian
>-- Searching 16 bit integer
>-- Looking for sys/types.h
>-- Looking for sys/types.h - found
>-- Looking for stdint.h
>-- Looking for stdint.h - found
>-- Looking for stddef.h
>-- Looking for stddef.h - found
>-- Check size of unsigned short
>-- Check size of unsigned short - done
>-- Using unsigned short
>-- Check if the system is big endian - little endian
>-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
>-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY - Success
>-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY
>-- Performing Test COMPILER_HAS_HIDDEN_INLINE_VISIBILITY - Success
>-- Performing Test COMPILER_HAS_DEPRECATED_ATTR
>-- Performing Test COMPILER_HAS_DEPRECATED_ATTR - Success
>--  ==> Doxygen is found:          TRUE
>--  ==> Graphviz Dot is found:     YES
>--  To build API documentation use 'make doc'
>-- Configuring done
>-- Generating done
>CMake Warning:
>  Manually-specified variables were not used by the project:
>
>    DIGIKAMSC_COMPILE_LIBKALCORE
>    DIGIKAMSC_COMPILE_LIBKSANE
>    DIGIKAMSC_COMPILE_LIBKVKONTAKTE
>    DIGIKAMSC_COMPILE_LIBMARBLE
>    DIGIKAMSC_COMPILE_LIBMEDIAWIKI
>    ENABLE_OPENCV3
>
>
>-- Build files have been written to: /home/fre/ARCH-AUR/digikam-git/src/build
>[35m[1mScanning dependencies of target dimg_src_autogen[0m
>[35m[1mScanning dependencies of target digikam-gitversion[0m
>[35m[1mScanning dependencies of target digikamdatabasemain_src_autogen[0m
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>[  1%] Built target digikamdatabase_src_autogen
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>[35m[1mScanning dependencies of target metadataedit_src_autogen[0m
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>[  3%] Built target panorama_src_autogen
>[35m[1mScanning dependencies of target mediaserver_src_autogen[0m
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>[  3%] [34m[1mAutomatic MOC for target digikamfacesengine[0m
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>[35m[1mScanning dependencies of target digikamfacesenginedatabase_src_autogen[0m
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>In file included from [01m[K/home/fre/ARCH-AUR/digikam-git/src/digikam/core/libs/dimg/filters/redeye/redeyecorrectionfilter.h:33[m[K,
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> #   include [01;31m[K<opencv/cv.h>[m[K
>             [01;31m[K^~~~~~~~~~~~~[m[K
>compilation terminated.
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>make: *** [Makefile:130: all] Error 2

Git commit 4cb2d62df23af09da60992004bf30c6607043672 by Maik Qualmann.
Committed on 22/11/2018 at 17:37.
Pushed by mqualmann into branch 'master'.

add patch from Arch Linux project to fix compile with OpenCV >= 4.0.0
This patch is not tested, please report if it works.

M  +14   -2    core/app/utils/digikam_opencv.h.cmake.in
M  +1    -1    core/libs/facesengine/detection/opencvfacedetector.cpp

https://commits.kde.org/digikam/4cb2d62df23af09da60992004bf30c6607043672

Please note that, even after this patch is applied, compilation will fail with unpatched opencv 4.0.0 due to https://github.com/opencv/opencv/issues/13201

After reinstalling Arch Aur opencv-4.0.0-4, I could compile successfully digikam-git r41327 with this patch.
Now, DK works "normally" for me. Wait and see...

Mistake, sorry:
I didn't install opencv-4 Arch Aur package BUT official Arch opencv 4.0.0-4 package from testing Arch repository.

Created attachment 116473 [details]
digikam r41327 full compilation with Arch opencv-4.0.0-4

A lot of compile warnings, we leave this bug report open until we officially support OpenCV-4.x.x. For digiKam-6.0.0 it will be OpenCV-3.x.x.

Maik

Maderios,

With current implementation from git/master (next 6.1.0) this kind of broken compilation with OpenCV must be fixed.

Can you confirm ?

Gilles Caulier

(In reply to caulier.gilles from comment #8)
> Maderios,
> 
> With current implementation from git/master (next 6.1.0) this kind of broken
> compilation with OpenCV must be fixed.
> 
> Can you confirm ?
> 
> Gilles Caulier

> With current implementation from git/master (next 6.1.0) this kind of broken
> compilation with OpenCV must be fixed.
> 
> Can you confirm ?
> 
> Gilles Caulier
Last time I compiled digikam, it was digikam-git r41548 with opencv 4.0.1-5 arch package without any problem. I use this digikam version every day. I'll tell you if it works with current git when i'll have time to compile.

Maderios,

Question : Here under Linux i compiled and installed the git/master code from OPenCV, and the install is well done at right place but Cmake configuration shared by the library indicate an install path at / of the system instead /usr. Of course digiKAm cannot be compiled in this case...

With OpenCV 3.4.5, all work as expected. I used the same configure script with git/master :

https://cgit.kde.org/digikam.git/tree/project/scripts/bootstrap.opencv-minimal-linux.sh

Which Cmake configuration did you set to compile and install OpenCV 4 ?

Gilles Caulier

Gilles
I use official opencv 4.0.1-5 Arch package. It is patched.
https://www.archlinux.org/packages/extra/x86_64/opencv/
PKGBUILD and patch here
https://git.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/opencv

Wonderful...

How a project as OpenCV can release the library with this kind of bug....

Gilles

There is an UPSTREAM bug for this problem ?
Gilles

(In reply to maderios from comment #11)
> Gilles
> I use official opencv 4.0.1-5 Arch package. It is patched.
> https://www.archlinux.org/packages/extra/x86_64/opencv/
> PKGBUILD and patch here
> https://git.archlinux.org/svntogit/packages.git/tree/trunk?h=packages/opencv

This patch only concerns the pkgconfig file so it's completely irrelevant for digikam (which uses cmake)

Ahah, and how to you think that your digiKam compiled in your computer has found the right OpenCV4 install path ? By Cmake of course, not pkgconfig.

So i ask again my question: how your OpenCV4 is configured from your system to be found properly with digiKam/cmake script ? From your trace, your OpenCV4 install path is right...

Gilles Caulier

(In reply to caulier.gilles from comment #15)
> Ahah, and how to you think that your digiKam compiled in your computer has
> found the right OpenCV4 install path ? By Cmake of course, not pkgconfig.

...which is exactly what I said

> So i ask again my question: how your OpenCV4 is configured from your system
> to be found properly with digiKam/cmake script ? From your trace, your
> OpenCV4 install path is right...

medeiros gave you this information in comment 11 already.

With opencv 4.0.1, digikam 6.0 builds correctly, but git master is broken since eeab1c8220e8ffa9987ce032c1a65536e1a333f4 - which makes it use deprecated headers again regardless of the opencv version.

No. this commit remove the dependency to obsolete OpenCV header. It's the oposite :

https://cgit.kde.org/digikam.git/commit/?id=eeab1c8220e8ffa9987ce032c1a65536e1a333f4

Deprecated headers are like : #include <opencv/...>

We only use headers from opencv2/ directory.

Also with this commit, i simplify the dependencies from OpenCV modules. We require less modules than before : 

https://cgit.kde.org/digikam.git/tree/core/CMakeLists.txt#n295

"core objdetect imgproc imgcodecs"

That all. of course, some OpenCV modules requires extra internal modules as objdetect which need :

- "calib3d" and "features2d" for OpenCV version 3
- "flann" for OpenCV version 4

I'm sure, i take a look in deep into OpenCV code which is a big monter.

So, if i'm wrong here, i would to know why exactly...

Gilles Caulier

To start with: you are unconditionally including  <opencv2/imgcodecs/imgcodecs_c.h>

This immediately throws an error with openCV 4:

/usr/include/opencv4/opencv2/imgcodecs/imgcodecs_c.h:1:2: error: #error "This header with legacy C API declarations has been removed from OpenCV. Legacy contants are available from legacy/constants_c.h file."

Ah. This one is deprecated with OpenCV 4 only, not OpenCV 3.

As i never configured successfully digiKam with OpenCV4, i never seen this warning, i will take a look.

Gilles Caulier

Git commit a38c26bbc57291172404b84e05ac2b82c6db9808 by Gilles Caulier.
Committed on 15/03/2019 at 14:52.
Pushed by cgilles into branch 'master'.

This header is deprecated with openCV4

M  +0    -1    core/app/utils/digikam_opencv.h.cmake.in

https://commits.kde.org/digikam/a38c26bbc57291172404b84e05ac2b82c6db9808

Git commit 7a5af66d8fc7ab8e78f05016eaf3e94de66951b3 by Gilles Caulier.
Committed on 15/03/2019 at 16:16.
Pushed by cgilles into branch 'master'.

fix broken compilation with OpenCV4 in Test::FaceEngine

M  +7    -1    core/tests/facesengine/preprocess.cpp

https://commits.kde.org/digikam/7a5af66d8fc7ab8e78f05016eaf3e94de66951b3

Fixed for me

Git commit 08423e488df2dc0346d9e18fd84c528354fe27bd by Gilles Caulier.
Committed on 15/03/2019 at 20:37.
Pushed by cgilles into branch 'master'.

fix broken compilation with OpenCV 3

M  +4    -0    core/app/utils/digikam_opencv.h.cmake.in

https://commits.kde.org/digikam/08423e488df2dc0346d9e18fd84c528354fe27bd

7.0.0-beta1 is ale to compile with OpenCV 4.2