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USR_LIBS defines the libraries that are baked into your application.  This is additive, so use +=.

USR_LIBS_<operating_system> e.g. USR_LIBS_Linux defines the libraries that are baked into your application when the target OS is <operating_system>, e.g. USR_LIBS_Linux.  This is additive, so use +=.

<lib>_DIR defines the directory in which the library (.a or .so) will be found.

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