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build system docs: Add some notes about project-level variables
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@ -124,6 +124,10 @@ These variables all have default values that can be overridden for custom behavi
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- ``EXTRA_COMPONENT_DIRS``: Optional list of additional directories to search for components.
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- ``COMPONENTS``: A list of component names to build into the project. Defaults to all components found in the COMPONENT_DIRS directories.
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Any paths in these Makefile variables should be absolute paths. You can convert relative paths using ``$(PROJECT_PATH)/xxx``, ``$(IDF_PATH)/xxx``, or use the Make function ``$(abspath xxx)``.
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These variables should all be set before the line ``include $(IDF_PATH)/make/project.mk`` in the Makefile.
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Component Makefiles
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-------------------
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