Since fides seems to allow it, I’ve tried to build with
-DFIDES_USE_EXTERNAL_RAPIDJSON=ON. However it fails as such:
CMake Error at CMake/vtkModule.cmake:3530 (add_library): Target "fides" links to target "RapidJSON::RapidJSON" but the target was not found. Perhaps a find_package() call is missing for an IMPORTED target, or an ALIAS target is missing? Call Stack (most recent call first): ThirdParty/fides/vtkfides/fides/CMakeLists.txt:42 (vtk_module_add_module)
Not sure what the issue is exactly, this is beyond my knowledge of CMake.