Created attachment 1252778 [details]
build.log

Created attachment 1252779 [details]
root.log

Created attachment 1252780 [details]
state.log

This bug appears to have been reported against 'rawhide' during the Fedora 26 development cycle.
Changing version to '26'.

errors so far:

/builddir/build/BUILD/libkface-16.12.2/src/recognition-opencv-lbph/facerec_borrowed.h:144:10: error: 'void KFaceIface::LBPHFaceRecognizer::predict(cv::InputArray, cv::Ptr<cv::face::PredictCollector>, int) const' marked 'override', but does not override
     void predict(cv::InputArray src, cv::Ptr<cv::face::PredictCollector> collector, const int state = 0) const override;
          ^~~~~~~

/builddir/build/BUILD/libkface-16.12.2/src/recognition-opencv-lbph/facerec_borrowed.cpp: In member function 'void KFaceIface::LBPHFaceRecognizer::predict(cv::InputArray, cv::Ptr<cv::face::PredictCollector>, int) const':
/builddir/build/BUILD/libkface-16.12.2/src/recognition-opencv-lbph/facerec_borrowed.cpp:407:52: error: no matching function for call to 'cv::face::PredictCollector::init(int, const int&)'
     collector->init((int)m_histograms.size(), state);

/builddir/build/BUILD/libkface-16.12.2/src/recognition-opencv-lbph/facerec_borrowed.cpp:473:29: error: 'class cv::face::PredictCollector' has no member named 'emit'; did you mean 'init'?
             if (!collector->emit(it->first, mean, state))
                             ^~~~

Filed upstream bug 
https://bugs.kde.org/show_bug.cgi?id=377425

re-confirming still FTBFS with latest upstream 17.04.0 release (and master/ branch has no relevant changes either)

*** Bug 1478133 has been marked as a duplicate of this bug. ***

Echoing comment added to upstream report:

Confirmed still an issue with kde-apps 17.08.1 release as well.

Notice if this isn't fixed soon, fedora will likely have to drop this package from it's collection.

fedora-obsolete-packages-27-8 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-743fe12b00

fedora-obsolete-packages-26-4 has been submitted as an update to Fedora 26. https://bodhi.fedoraproject.org/updates/FEDORA-2017-46d08cca05

fedora-obsolete-packages-26-4 has been pushed to the Fedora 26 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-46d08cca05

fedora-obsolete-packages-27-8 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-743fe12b00

fedora-obsolete-packages-27-9 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2017-3d445455c4

fedora-obsolete-packages-27-8 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

fedora-obsolete-packages-27-9 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2017-3d445455c4

fedora-obsolete-packages-26-4 has been pushed to the Fedora 26 stable repository. If problems still persist, please make note of it in this bug report.

fedora-obsolete-packages-27-9 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.

I'm reopening because package should be retired from rawhide and is not [1] .
So for me we need the action of retire this package , please .  

Thanks

[1] 
wget https://kojipkgs.fedoraproject.org/compose/rawhide/latest-Fedora-Rawhide/logs/x86_64/repoclosure-Everything.x86_64.log -qO-  | grep kface -A10
package: kf5-libkface-16.08.3-1.fc26.i686 from repoclosure-Everything.x86_64
  unresolved deps:
    libopencv_core.so.3.1
    libopencv_face.so.3.1
    libopencv_highgui.so.3.1
    libopencv_imgcodecs.so.3.1
    libopencv_imgproc.so.3.1
    libopencv_ml.so.3.1
    libopencv_objdetect.so.3.1
    libopencv_videoio.so.3.1
package: kf5-libkface-16.08.3-1.fc26.x86_64 from repoclosure-Everything.x86_64
  unresolved deps:
    libopencv_core.so.3.1()(64bit)
    libopencv_face.so.3.1()(64bit)
    libopencv_highgui.so.3.1()(64bit)
    libopencv_imgcodecs.so.3.1()(64bit)
    libopencv_imgproc.so.3.1()(64bit)
    libopencv_ml.so.3.1()(64bit)
    libopencv_objdetect.so.3.1()(64bit)
    libopencv_videoio.so.3.1()(64bit)

I ran fedpkg retire, fyi. Maybe something went wrong

OK, confirmed it definitely didn't work last time, let's hope this one sticks.

https://src.fedoraproject.org/rpms/kf5-libkface/c/b4433acbedc9c50dace56da66b691e80e2dc7e40