Not all submodules are available after clone or updated when issuing 'submodule update' on a cleanly cloned source tree
vtkprotobuf submodule is not available after
git clone --recursive nor is updated after
submodule update. Only after running
Utilities/SetupForDevelopment.sh is it available. It looks like there are more submodules that are only initialized by the SetupForDevelopment.sh script.
Can this be tuned, such that a
git clone --recursive creates a valid source tree?