[QGIS-Developer] Unable to build QGIS master due to multiple definitions of sipQgs3DAlgorithms

[matteo]

Hi all,

similar issue here on Debian Sid. With Saber suggestions, the 
compilation fails:

/usr/bin/ld: CMakeFiles/qgis_3d.dir/qgswindow3dengine.cpp.o: in function 
`QgsWindow3DEngine::QgsWindow3DEngine(QObject*)':
qgswindow3dengine.cpp:(.text+0x9e): undefined reference to 
`Qt3DExtras::Qt3DWindow::Qt3DWindow(QScreen*)'
collect2: error: ld returned 1 exit status
make[2]: *** [src/3d/CMakeFiles/qgis_3d.dir/build.make:1321: 
output/lib/libqgis_3d.so.3.17.0] Error 1
make[1]: *** [CMakeFiles/Makefile2:6787: 
src/3d/CMakeFiles/qgis_3d.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....

I removed completely the build folder and stared from scratch. This is 
the cmake configuration:

cmake ../QGIS -DCMAKE_PREFIX_PATH=$(realpath 
../QGIS/external/qt3dextra-headers/cmake/Qt53DExtras/) 
-DQT5_3DEXTRA_INCLUDE_DIR=$(realpath ../QGIS/external/qt3dextra-headers) 
-DQT5_3DEXTRA_LIBRARY=/usr/lib/x86_64-linux-gnu/libQt53DExtras.so 
-DWITH_3D=True -DQt53DExtras_DIR=$(realpath 
../QGIS/external/qt3dextra-headers/cmake/Qt53DExtras/)

some other suggestions?

Cheers and thanks

Matteo