[build2] How to do automatic header dependency extraction?

[Joshua Olson]

It's mentioned here[1] and here[2]. Is it done implicitly? Can I get a list
from my project so I can see if paths are configured correctly?

[1] https://build2.org/article/preprocess-compile-performance.xhtml
[2] https://build2.org/faq.xhtml#why-another
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