QMake INCLUDEPATH Recursively search in all Subdirectories (ITK Setup)

[wysota]

I will definitely not include every time I need a new class include it search for its path.

That is a standard approach for every library I know of.

And you definitely don't want your compiler to search for every include file in thousands of directories. Unless you are paid by an hour and don't care that the compilation takes 10 times as long as needed.