Using GCC 5.3.0 and cmake 3.5.1 build fails with this error:

[ 81%] Building CXX object utilities/queuemanager/CMakeFiles/queuemanager_src.dir/manager/batchtoolsmanager.cpp.o
In file included from /tmp/digikam/utilities/kdesupport/kipi/kipiimagecollectionselector.cpp:49:0:
/tmp/digikam/utilities/kdesupport/kipi/kipiinterface.h:86:12: error: conflicting return type specified for 'virtual void Digikam::KipiInterface::preview(const QUrl&, int)'
     void   preview(const QUrl& url, int resizedTo);
            ^
In file included from /usr/include/KF5/KIPI/KIPI/Interface:1:0,
                 from /tmp/digikam/utilities/kdesupport/kipi/kipiinterface.h:41,
                 from /tmp/digikam/utilities/kdesupport/kipi/kipiimagecollectionselector.cpp:49:
/usr/include/KF5/KIPI/kipi/interface.h:357:20: error:   overriding 'virtual QImage KIPI::Interface::preview(const QUrl&, int)'
     virtual QImage preview(const QUrl& url, int minSize);
                    ^
/usr/include/KF5/KIPI/kipi/interface.h:378:18: warning: 'virtual void KIPI::Interface::preview(const QUrl&, int, int)' was hidden [-Woverloaded-virtual]
     virtual void preview(const QUrl& url, int minSize, int resizedTo=-1);
                  ^
In file included from /tmp/digikam/utilities/kdesupport/kipi/kipiimagecollectionselector.cpp:49:0:
/tmp/digikam/utilities/kdesupport/kipi/kipiinterface.h:86:12: warning:   by 'Digikam::KipiInterface::preview' [-Woverloaded-virtual]
     void   preview(const QUrl& url, int resizedTo);
            ^
utilities/kdesupport/kipi/CMakeFiles/kipiiface_src.dir/build.make:86: recipe for target 'utilities/kdesupport/kipi/CMakeFiles/kipiiface_src.dir/kipiimagecollectionselector.cpp.o' failed
make[2]: *** [utilities/kdesupport/kipi/CMakeFiles/kipiiface_src.dir/kipiimagecollectionselector.cpp.o] Error 1
CMakeFiles/Makefile2:7465: recipe for target 'utilities/kdesupport/kipi/CMakeFiles/kipiiface_src.dir/all' failed
make[1]: *** [utilities/kdesupport/kipi/CMakeFiles/kipiiface_src.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....