<div dir="ltr">I had a similar issue, what I did:<div>- Wiped my build folder</div><div>- Recompiled using an extra cmake option (as per Martin's suggestion):</div><div><font face="monospace">cmake -GNinja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_PREFIX_PATH=/{path to QGIS Git repo}/external/qt3dextra-headers/cmake/Qt53DExtras -DQT5_3DEXTRA_INCLUDE_DIR=/{path to QGIS Git repo}/external/qt3dextra-headers -DQT5_3DEXTRA_LIBRARY=/usr/lib/x86_64-linux-gnu/libQt53DExtras.so -DWITH_3D=True -DQt53DExtras_DIR=/{path to QGIS Git repo}/external/qt3dextra-headers/cmake/Qt53DExtras ..</font><br></div><div><font face="monospace"><br></font></div><div>Note the extra option: <font face="monospace">-DQt53DExtras_DIR=/{path to QGIS Git repo}/external/qt3dextra-headers/cmake/Qt53DExtras </font>which is not in <a href="https://github.com/qgis/QGIS/blob/master/INSTALL.md#3-building-on-gnulinux">https://github.com/qgis/QGIS/blob/master/INSTALL.md#3-building-on-gnulinux</a><font face="monospace"><br></font></div><div><br></div><div>Kind regards</div><div>Saber</div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 20 Jul 2020 at 08:18, matteo <<a href="mailto:matteo.ghetta@gmail.com">matteo.ghetta@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi all,<br>
<br>
I got an error when compiling QGIS with 3D support on Debian SID:<br>
<br>
......a bunch of similar lines......<br>
<br>
/usr/bin/ld: CMakeFiles/python_module_qgis__3d.dir/3d/sip_3dpart5.cpp.o:<br>
in function `sipQgs3DAlgorithms::sipProtectVirt_loadAlgorithms(bool)':<br>
sip_3dpart5.cpp:(.text+0x8a98): multiple definition of<br>
`sipQgs3DAlgorithms::sipProtectVirt_loadAlgorithms(bool)';<br>
CMakeFiles/python_module_qgis__3d.dir/3d/sip_3dpart4.cpp.o:sip_3dpart4.cpp:(.text+0x8ea0):<br>
first defined here<br>
/usr/bin/ld:<br>
CMakeFiles/python_module_qgis__3d.dir/3d/sip_3dpart5.cpp.o:(.data.rel.local+0x420):<br>
multiple definition of `sipTypeDef__3d_Qgs3DAlgorithms';<br>
CMakeFiles/python_module_qgis__3d.dir/3d/sip_3dpart4.cpp.o:(.data.rel.local+0x580):<br>
first defined here<br>
collect2: error: ld returned 1 exit status<br>
make[2]: ***<br>
[python/CMakeFiles/python_module_qgis__3d.dir/build.make:817:<br>
output/python/qgis/_3d.so] Error 1<br>
make[2]: Leaving directory '/home/matteo/dev/qgis-master'<br>
make[1]: *** [CMakeFiles/Makefile2:5772:<br>
python/CMakeFiles/python_module_qgis__3d.dir/all] Error 2<br>
make[1]: *** Waiting for unfinished jobs..<br>
<br>
<br>
if the 3D support is deactivated then all is working fine.<br>
<br>
not sure which commit introduced this problem.<br>
<br>
Cheers and thanks<br>
<br>
Matteo<br>
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