Hello everyone - This is not a big deal to me because 1) I know how to get around it and 2) I don't use Loch anyway. However, for those to DO care, I thought I would post some information. The final few lines of the compile run are listed below. This is from 64-bit Fedora 21 and Therion 5.3.15. VTK version 6.1.0-18.fc21 is installed using the RPM packages from the main Fedora repository. I had to link the existing vtk directory to the location where Therion's make file expected it. ln -s /usr/include/vtk /usr/local/include/vtk-5.4 Without the link it fails much earlier in the loch compile. Based on this it appears to me that major changes have been made between vtk 5 and 6. Eventually I am sure other people will run into this problem. The workaround is to modify makefile so that it never attempts to compile loch. There is also a change to makeinstall.tcl. Bill Gee ================ lxData.cxx:543:28: error: ‘class vtkPolyDataNormals’ has no member named ‘SetInput’ this->scrapWallsNormals->SetInput(this->scrapWalls); ^ lxData.cxx:550:19: error: ‘class vtkAppendPolyData’ has no member named ‘AddInput’ this->allWalls->AddInput(this->scrapWallsNormals->GetOutput()); ^ lxData.cxx:551:19: error: ‘class vtkAppendPolyData’ has no member named ‘AddInput’ this->allWalls->AddInput(this->lrudWalls); ^ lxData.cxx:553:27: error: ‘class vtkTriangleFilter’ has no member named ‘SetInput’ this->allWallsTriangle->SetInput(this->allWalls->GetOutput()); ^ lxData.cxx:554:25: error: ‘class vtkDepthSortPolyData’ has no member named ‘SetInput’ this->allWallsSorted->SetInput(this->allWallsTriangle->GetOutput()); ^ lxData.cxx:556:27: error: ‘class vtkStripper’ has no member named ‘SetInput’ this->allWallsStripped->SetInput(this->allWallsTriangle->GetOutput()); ^ lxData.cxx:559:24: error: ‘class vtkPolyDataNormals’ has no member named ‘SetInput’ this->surfaceNormals->SetInput(this->surface); ^ lxData.cxx:562:26: error: ‘class vtkTriangleFilter’ has no member named ‘SetInput’ this->surfaceTriangle->SetInput(this->surfaceNormals->GetOutput()); ^ lxData.cxx:563:24: error: ‘class vtkDepthSortPolyData’ has no member named ‘SetInput’ this->surfaceSorted->SetInput(this->surfaceTriangle->GetOutput()); ^ lxData.cxx: In member function ‘void lxData::ExportVTK(wxString)’: lxData.cxx:585:6: error: ‘class vtkPolyDataWriter’ has no member named ‘SetInput’ w->SetInput(this->allWallsStripped->GetOutput()); ^ Makefile:110: recipe for target '.././loch/lxData.o' failed make[1]: *** [.././loch/lxData.o] Error 1 make[1]: Leaving directory '/home/bgee/Installs/therion/loch' Makefile:182: recipe for target 'loch/loch' failed make: *** [loch/loch] Error 2 ==================