DataObjectBackendInterface fails to compile: `duplicate symbol __ZTS37vtkDataObjectImplicitBackendInterfaceIiE`

:info:build [ 49%] Building CXX object Common/DataModel/CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx.o
:info:build cd /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/DataModel && /opt/local/bin/ccache /opt/local/bin/g++-mp-14 -DCommonDataModel_EXPORTS -Dkiss_fft_scalar=double -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/DataModel -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/DataModel -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Core -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Core -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token/vtktoken/token -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token/vtktoken/token -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token/vtktoken -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token/vtktoken -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson/vtknlohmannjson -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/nlohmannjson/vtknlohmannjson -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson/vtknlohmannjson/include -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Math -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Math -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/kissfft/vtkkissfft -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/kissfft/vtkkissfft -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Transforms -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Transforms -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Misc -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Misc -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/System -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/System -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pugixml/vtkpugixml -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml/vtkpugixml -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml/vtkpugixml/src -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Utilities/KWIML -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Utilities/KWIML -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Utilities/KWSys -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Utilities/KWSys -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/nlohmannjson -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/kissfft -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/kissfft -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pegtl -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pegtl -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pugixml -pipe -Os -fpermissive -DNDEBUG -isystem/opt/local/include/LegacySupport -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0  -O3 -DNDEBUG -std=c++11 -arch ppc -mmacosx-version-min=10.6 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT Common/DataModel/CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx.o -MF CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx.o.d -o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx.o -c /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/DataModel/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx
:info:build [ 49%] Building CXX object Common/DataModel/CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLevelEntry.cxx.o
:info:build cd /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/DataModel && /opt/local/bin/ccache /opt/local/bin/g++-mp-14 -DCommonDataModel_EXPORTS -Dkiss_fft_scalar=double -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/DataModel -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/DataModel -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Core -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Core -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token/vtktoken/token -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token/vtktoken/token -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token/vtktoken -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token/vtktoken -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson/vtknlohmannjson -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/nlohmannjson/vtknlohmannjson -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson/vtknlohmannjson/include -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Math -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Math -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/kissfft/vtkkissfft -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/kissfft/vtkkissfft -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Transforms -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Transforms -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/Misc -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/Misc -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/System -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/System -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pugixml/vtkpugixml -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml/vtkpugixml -I/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml/vtkpugixml/src -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Utilities/KWIML -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Utilities/KWIML -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Utilities/KWSys -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Utilities/KWSys -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/token -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/token -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/nlohmannjson -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/nlohmannjson -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/kissfft -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/kissfft -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pegtl -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pegtl -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/ThirdParty/pugixml -isystem /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/ThirdParty/pugixml -pipe -Os -fpermissive -DNDEBUG -isystem/opt/local/include/LegacySupport -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0  -O3 -DNDEBUG -std=c++11 -arch ppc -mmacosx-version-min=10.6 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -MD -MT Common/DataModel/CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLevelEntry.cxx.o -MF CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLevelEntry.cxx.o.d -o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLevelEntry.cxx.o -c /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/VTK-9.4.0/Common/DataModel/vtkHyperTreeGridLevelEntry.cxx
:info:build [ 49%] Linking CXX shared library ../../lib/libvtkCommonDataModel-9.4.dylib
:info:build cd /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/Common/DataModel && /opt/local/bin/cmake -E cmake_link_script CMakeFiles/CommonDataModel.dir/link.txt --verbose=ON
:info:build /opt/local/bin/g++-mp-14 -pipe -Os -fpermissive -DNDEBUG -isystem/opt/local/include/LegacySupport -I/opt/local/include -D_GLIBCXX_USE_CXX11_ABI=0  -O3 -DNDEBUG -arch ppc -mmacosx-version-min=10.6 -dynamiclib -Wl,-headerpad_max_install_names -Wl,-headerpad_max_install_names -L/opt/local/lib -lMacportsLegacySupport -Wl,-rpath,/opt/local/lib/libgcc  -compatibility_version 1.0.0 -current_version 9.4.0 -o ../../lib/libvtkCommonDataModel-9.4.9.4.dylib -install_name @rpath/libvtkCommonDataModel-9.4.1.dylib CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateChar.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateDouble.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateFloat.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateInt.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateLong.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateLongLong.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateShort.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateSignedChar.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateUnsignedChar.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateUnsignedInt.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateUnsignedLong.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateUnsignedLongLong.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateUnsignedShort.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateIdType.cxx.o CMakeFiles/CommonDataModel.dir/vtkAMRBox.cxx.o CMakeFiles/CommonDataModel.dir/vtkAMRUtilities.cxx.o CMakeFiles/CommonDataModel.dir/vtkAbstractCellArray.cxx.o CMakeFiles/CommonDataModel.dir/vtkAbstractCellLinks.cxx.o CMakeFiles/CommonDataModel.dir/vtkAbstractCellLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkAbstractElectronicData.cxx.o CMakeFiles/CommonDataModel.dir/vtkAbstractPointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkAdjacentVertexIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkAnimationScene.cxx.o CMakeFiles/CommonDataModel.dir/vtkAnnotation.cxx.o CMakeFiles/CommonDataModel.dir/vtkAnnotationLayers.cxx.o CMakeFiles/CommonDataModel.dir/vtkAnnulus.cxx.o CMakeFiles/CommonDataModel.dir/vtkArrayData.cxx.o CMakeFiles/CommonDataModel.dir/vtkAtom.cxx.o CMakeFiles/CommonDataModel.dir/vtkAttributesErrorMetric.cxx.o CMakeFiles/CommonDataModel.dir/vtkBSPCuts.cxx.o CMakeFiles/CommonDataModel.dir/vtkBSPIntersections.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierCurve.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierInterpolation.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierQuadrilateral.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierTetra.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkBezierWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkBiQuadraticQuad.cxx.o CMakeFiles/CommonDataModel.dir/vtkBiQuadraticQuadraticHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkBiQuadraticQuadraticWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkBiQuadraticTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkBond.cxx.o CMakeFiles/CommonDataModel.dir/vtkBoundingBox.cxx.o CMakeFiles/CommonDataModel.dir/vtkBox.cxx.o CMakeFiles/CommonDataModel.dir/vtkCell.cxx.o CMakeFiles/CommonDataModel.dir/vtkCell3D.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellArray.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellArrayIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellAttribute.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellAttributeCalculator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellData.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridBoundsQuery.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridCopyQuery.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridEvaluator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridRangeQuery.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridQuery.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridResponders.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridSidesCache.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellGridSidesQuery.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellLinks.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellLocatorStrategy.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellMetadata.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellTreeLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCellTypes.cxx.o CMakeFiles/CommonDataModel.dir/vtkClosestNPointsStrategy.cxx.o CMakeFiles/CommonDataModel.dir/vtkClosestPointStrategy.cxx.o CMakeFiles/CommonDataModel.dir/vtkCompositeDataIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkCompositeDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkCone.cxx.o CMakeFiles/CommonDataModel.dir/vtkConvexPointSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkCoordinateFrame.cxx.o CMakeFiles/CommonDataModel.dir/vtkCubicLine.cxx.o CMakeFiles/CommonDataModel.dir/vtkCylinder.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataAssembly.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataAssemblyUtilities.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObject.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectTree.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectTreeIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataObjectTypes.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataSetAttributes.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataSetAttributesFieldList.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataSetCellIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkDataSetCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkDirectedAcyclicGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkDirectedGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkDistributedGraphHelper.cxx.o CMakeFiles/CommonDataModel.dir/vtkEdgeListIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkEdgeTable.cxx.o CMakeFiles/CommonDataModel.dir/vtkEmptyCell.cxx.o CMakeFiles/CommonDataModel.dir/vtkExplicitStructuredGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkExtractStructuredGridHelper.cxx.o CMakeFiles/CommonDataModel.dir/vtkFieldData.cxx.o CMakeFiles/CommonDataModel.dir/vtkFindCellStrategy.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericAdaptorCell.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericAttribute.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericAttributeCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericCell.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericCellIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericCellTessellator.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericEdgeTable.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericInterpolatedVelocityField.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericPointIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkGenericSubdivisionErrorMetric.cxx.o CMakeFiles/CommonDataModel.dir/vtkGeometricErrorMetric.cxx.o CMakeFiles/CommonDataModel.dir/vtkGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkGraphEdge.cxx.o CMakeFiles/CommonDataModel.dir/vtkGraphInternals.cxx.o CMakeFiles/CommonDataModel.dir/vtkHexagonalPrism.cxx.o CMakeFiles/CommonDataModel.dir/vtkHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkHierarchicalBoxDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderCurve.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderInterpolation.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderQuadrilateral.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderTetra.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkHigherOrderWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTree.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometricLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedGeometryCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedUnlimitedGeometryCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedMooreSuperCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedMooreSuperCursorLight.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedUnlimitedMooreSuperCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedSuperCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedSuperCursorLight.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedUnlimitedSuperCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedVonNeumannSuperCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridNonOrientedVonNeumannSuperCursorLight.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridOrientedCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridOrientedGeometryCursor.cxx.o CMakeFiles/CommonDataModel.dir/vtkImageData.cxx.o CMakeFiles/CommonDataModel.dir/vtkImageIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkImageTransform.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitBoolean.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitFunction.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitFunctionCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitHalo.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitSelectionLoop.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitSum.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitVolume.cxx.o CMakeFiles/CommonDataModel.dir/vtkImplicitWindowFunction.cxx.o CMakeFiles/CommonDataModel.dir/vtkInEdgeIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkIncrementalOctreeNode.cxx.o CMakeFiles/CommonDataModel.dir/vtkIncrementalOctreePointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkIncrementalPointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkInformationQuadratureSchemeDefinitionVectorKey.cxx.o CMakeFiles/CommonDataModel.dir/vtkIterativeClosestPointTransform.cxx.o CMakeFiles/CommonDataModel.dir/vtkKdNode.cxx.o CMakeFiles/CommonDataModel.dir/vtkKdTree.cxx.o CMakeFiles/CommonDataModel.dir/vtkKdTreePointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeCurve.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeInterpolation.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeQuadrilateral.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeTetra.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkLagrangeWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkLine.cxx.o CMakeFiles/CommonDataModel.dir/vtkLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkMarchingCubesTriangleCases.cxx.o CMakeFiles/CommonDataModel.dir/vtkMarchingCubesPolygonCases.cxx.o CMakeFiles/CommonDataModel.dir/vtkMarchingSquaresLineCases.cxx.o CMakeFiles/CommonDataModel.dir/vtkMeanValueCoordinatesInterpolator.cxx.o CMakeFiles/CommonDataModel.dir/vtkMergePoints.cxx.o CMakeFiles/CommonDataModel.dir/vtkMolecule.cxx.o CMakeFiles/CommonDataModel.dir/vtkMultiBlockDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkMultiPieceDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkMutableDirectedGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkMutableUndirectedGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkNonLinearCell.cxx.o CMakeFiles/CommonDataModel.dir/vtkNonMergingPointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkOctreePointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkOctreePointLocatorNode.cxx.o CMakeFiles/CommonDataModel.dir/vtkOrderedTriangulator.cxx.o CMakeFiles/CommonDataModel.dir/vtkOutEdgeIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkPartitionedDataSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkPartitionedDataSetCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkPath.cxx.o CMakeFiles/CommonDataModel.dir/vtkPentagonalPrism.cxx.o CMakeFiles/CommonDataModel.dir/vtkPerlinNoise.cxx.o CMakeFiles/CommonDataModel.dir/vtkPiecewiseFunction.cxx.o CMakeFiles/CommonDataModel.dir/vtkPixel.cxx.o CMakeFiles/CommonDataModel.dir/vtkPixelExtent.cxx.o CMakeFiles/CommonDataModel.dir/vtkPixelTransfer.cxx.o CMakeFiles/CommonDataModel.dir/vtkPlane.cxx.o CMakeFiles/CommonDataModel.dir/vtkPlaneCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkPlanes.cxx.o CMakeFiles/CommonDataModel.dir/vtkPlanesIntersection.cxx.o CMakeFiles/CommonDataModel.dir/vtkPointData.cxx.o CMakeFiles/CommonDataModel.dir/vtkPointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkPointSet.cxx.o CMakeFiles/CommonDataModel.dir/vtkPointSetCellIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkPointsProjectedHull.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyData.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyDataCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyLine.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyPlane.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyVertex.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolygon.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyhedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkPolyhedronUtilities.cxx.o CMakeFiles/CommonDataModel.dir/vtkPyramid.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuad.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticEdge.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticLinearQuad.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticLinearWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticPolygon.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticPyramid.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticQuad.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticTetra.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadraticWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadratureSchemeDefinition.cxx.o CMakeFiles/CommonDataModel.dir/vtkQuadric.cxx.o CMakeFiles/CommonDataModel.dir/vtkRectilinearGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkReebGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkReebGraphSimplificationMetric.cxx.o CMakeFiles/CommonDataModel.dir/vtkSelection.cxx.o CMakeFiles/CommonDataModel.dir/vtkSelectionNode.cxx.o CMakeFiles/CommonDataModel.dir/vtkSimpleCellTessellator.cxx.o CMakeFiles/CommonDataModel.dir/vtkSmoothErrorMetric.cxx.o CMakeFiles/CommonDataModel.dir/vtkSortFieldData.cxx.o CMakeFiles/CommonDataModel.dir/vtkSphere.cxx.o CMakeFiles/CommonDataModel.dir/vtkSpheres.cxx.o CMakeFiles/CommonDataModel.dir/vtkSphericalPointIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkSpline.cxx.o CMakeFiles/CommonDataModel.dir/vtkStaticCellLinks.cxx.o CMakeFiles/CommonDataModel.dir/vtkStaticCellLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkStaticPointLocator.cxx.o CMakeFiles/CommonDataModel.dir/vtkStaticPointLocator2D.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredCellArray.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredData.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredExtent.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredPoints.cxx.o CMakeFiles/CommonDataModel.dir/vtkStructuredPointsCollection.cxx.o CMakeFiles/CommonDataModel.dir/vtkSuperquadric.cxx.o CMakeFiles/CommonDataModel.dir/vtkTable.cxx.o CMakeFiles/CommonDataModel.dir/vtkTetra.cxx.o CMakeFiles/CommonDataModel.dir/vtkTree.cxx.o CMakeFiles/CommonDataModel.dir/vtkTreeBFSIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkTreeDFSIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkTreeIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkTriQuadraticHexahedron.cxx.o CMakeFiles/CommonDataModel.dir/vtkTriQuadraticPyramid.cxx.o CMakeFiles/CommonDataModel.dir/vtkTriangle.cxx.o CMakeFiles/CommonDataModel.dir/vtkTriangleStrip.cxx.o CMakeFiles/CommonDataModel.dir/vtkUndirectedGraph.cxx.o CMakeFiles/CommonDataModel.dir/vtkUniformGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkUniformHyperTreeGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkUnstructuredGrid.cxx.o CMakeFiles/CommonDataModel.dir/vtkUnstructuredGridBase.cxx.o CMakeFiles/CommonDataModel.dir/vtkUnstructuredGridCellIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkVertex.cxx.o CMakeFiles/CommonDataModel.dir/vtkVertexListIterator.cxx.o CMakeFiles/CommonDald: duplicate symbol __ZTS37vtkDataObjectImplicitBackendInterfaceIiE in CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateIdType.cxx.o and CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateInt.cxx.o
:info:build collect2: error: ld returned 1 exit status
:info:build taModel.dir/vtkVoxel.cxx.o CMakeFiles/CommonDataModel.dir/vtkWedge.cxx.o CMakeFiles/CommonDataModel.dir/vtkXMLDataElement.cxx.o CMakeFiles/CommonDataModel.dir/vtkAMRDataInternals.cxx.o CMakeFiles/CommonDataModel.dir/vtkAMRInformation.cxx.o CMakeFiles/CommonDataModel.dir/vtkNonOverlappingAMR.cxx.o CMakeFiles/CommonDataModel.dir/vtkOverlappingAMR.cxx.o CMakeFiles/CommonDataModel.dir/vtkUniformGridAMR.cxx.o CMakeFiles/CommonDataModel.dir/vtkUniformGridAMRDataIterator.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridEntry.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryEntry.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedEntry.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryLevelEntry.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridGeometryUnlimitedLevelEntry.cxx.o CMakeFiles/CommonDataModel.dir/vtkHyperTreeGridLevelEntry.cxx.o  -Wl,-rpath,/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build/lib ../../lib/libvtkCommonTransforms-9.4.9.4.dylib ../../lib/libvtkCommonMisc-9.4.9.4.dylib ../../lib/libvtkCommonSystem-9.4.9.4.dylib ../../lib/libvtkpugixml-9.4.9.4.dylib -latomic ../../lib/libvtkCommonMath-9.4.9.4.dylib ../../lib/libvtkkissfft-9.4.9.4.dylib ../../lib/libvtkCommonCore-9.4.9.4.dylib ../../lib/libvtktoken-9.4.9.4.dylib ../../lib/libvtksys-9.4.9.4.dylib
:info:build make[2]: *** [lib/libvtkCommonDataModel-9.4.9.4.dylib] Error 1
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build'
:info:build make[1]: *** [Common/DataModel/CMakeFiles/CommonDataModel.dir/all] Error 2
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build'
:info:build make: *** [all] Error 2
:info:build make: Leaving directory `/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build'
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_graphics_vtk/vtk/work/build" && /usr/bin/make -j6 -w all VERBOSE=ON 
:info:build Exit code: 2

Relevant part is:

ld: duplicate symbol __ZTS37vtkDataObjectImplicitBackendInterfaceIiE in CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateIdType.cxx.o and CMakeFiles/CommonDataModel.dir/vtkDataObjectImplicitBackendInstantiateInt.cxx.o
collect2: error: ld returned 1 exit status

The module was introduced in https://github.com/Kitware/VTK/commit/86ff7ff499fb6d8a9dfdcc670a87c95e4bc5bd4d