building opencv_contrib - minimum dependencies [closed]

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I regular rebuild opencv for a variety of tiny embedded platforms. As a result I constantly find myself configuring and reconfiguring to get things to build - because I cannot find a determinative reference that tells me how each module depends on other modules.

A good example is my current challenge - getting a minimum build with aruco on small arm system (nanoPi NEO Air - an awesome little beast). Small size is important - but I am finding that as I cut things back, at a certain point it no longer even tries to build anything in opencv_contrib. No errors - just does not attempt to build aruco, or anything else in contrib.

I am sure you can imagine the headache, as I guess my way towards a larger footprint that will finally build.

Anybody got any ideas? Does such a reference exist? Is it implied somewhere in the docs that I have just missed? Is it buried make files?

thanks!