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CMAKE_SOURCE_DIR corresponds to the top project's source directory. CMAKE_BINARY_DIR corresponds to the top project's binary directory. The usage of these variables doesn't cause any problems when Opus is built as a standalone project. This is not the case when Opus is added as submodule: the variables are set by the project that calls "add_subdirectory()". The fix consists in using PROJECT_SOURCE_DIR and PROJECT_BINARY_DIR, which always refer to the current project. Signed-off-by: Mark Harris <mark.hsj@gmail.com>