Only necessary to compile ITKCommon with KWSys & VXL

Greetings!

What are the settings via CMake to generate only the basic compilation for ITK right now there is a compilation error with ITK_BUILD_DEFAULT_MODULES option.

See error compilation here : https://github.com/commontk/CTK/issues/949#issuecomment-777074362

@al-sabr as commented in the CTK issue, please investigate the difference between ITK’s CMake configuration and the CTK SuperBuild CMake configuration.

What does this mean? Can you be more detailed if you know something about the difference?

CTK’s CMake configuration consists of ExternalProject’s.

I know this already that’s why I add ITK_DIR to my local development path for ITK so that it doesn’t download anything from the default repo.