Although Atri does a good job in general, the VTK 9.0 update was IMHO rushed (and thats the reason I did not accept the SR, unfortunately someone else did ...): 1- Fails to build on ARM 2. Java bindings are removed on 15.1, but devel dependencies still reference Java package and most importantly: 3. VTK 9.0 is API incompatible to FreeCAD and CSXCAD, the two users of VTK in TW.