[CMake] Setting up a folder structure?

[motes motes]

I am setting up a new project that I need to build with cmake. It has the
following structure:

/lib

/registration
/registration/typeA
/registration/typeB

/validation




1) In /registration/typeA I need a main file to run the typeA application.
2) In /registration/typeB I need a main file to run the typeB application.
3) In /validation I need a main file to run the validation application.
4) In / I need a main file to run the all the above application.

As I understand I therefore need a CMakeLists.txt file in:

/
/registration/typeA/
/registration/typeB/
/validation/

totalling 4 CMakeLists.txt files in total. Am I doing it right?
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