Add EXTRA_COMPONENT_DIRS?

[GreenGiant]

In the build system (on release v4.1), we can do:

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set(EXTRA_COMPONENT_DIRS foo)

If, inside foo, I want to include a component from somewhere else, not in the current tree, is there a way to add another directory from within Foo's CMakeLists.txt?

Something like:

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add(EXTRA_COMPONENT_DIRS bar)