Rather than necro this thread which I started last year, the recent release of a Raspberry Pi OS 64bit beta and the recent progress on booting pi4 from USB3.0 means I thought it would be worth trying again. I have hit some errors in make (having avoided the issues I worked around in the previous thread). I would like to say thanks to @thorsten and @kdv (sorry - I didn't see your replies on the previous thread) for all their support so far.
As we know, vtk5 isn't available so we can choose from vtk6.3 or vtk7 (7.1.1 at the moment, I think).
I managed to get quite far through the build but the logs (attached for each version of vtk tried) show that the compiler is trying to access files that haven't been placed in the locations specified.
I think it is failing at this line:
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# vtk
find_package(VTK COMPONENTS vtkIOXML vtkIOGeometry vtkIOLegacy vtkIOPLY NO_MODULE REQUIRED)
I have had a quick look in CMakeLists.txt in
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openEMS-Project/openEMS
After the failure of vtk build, I fall foul of the
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message(FATAL_ERROR "Unsupported target architecture! Try porting openEMS to your architecture...")