[Interest] Option for ./configure to fail when missing webengine prerequisites?

[Isaiah Norton]

Hi.

I would like to have ./configure fail when prerequisites for webengine are
not found. This is on Ubuntu 16.04. Currently I am using:


   ./configure -release -opensource -confirm-license -c++std c++11 \
   -nomake examples -nomake tests -no-rpath -silent

qtwebengine was missing from the resulting build, apparently having been
skipped during configure because I was missing some set of libraries. I've
tried `-make webengine`, `-make qtwebengine` and some other guesses, to try
to force webengine as an essential module, but those options don't exist.

How do I make configure error out when webengine *won't* be built?

(ps: I found what I needed for the dependency issue... But what I want is
to provide a model `./configure` command line that will fail-fast for our
end users, so that they don't build a Qt library that is missing webengine
-- a dependency for our application. Seems like homebrew has had the same
problem: https://github.com/Homebrew/homebrew-core/pull/
2087#issuecomment-231960871)

Thanks,
Isaiah
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