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organization of this directory is moving towards this approach: <module>.h -- public API and data types <module>_private.h -- protected API and data types <module>.c -- implementation and private API / types The rules are: .c files may include *_private.h. .h files may not include *_private.h This allows us to have a nicely encapsulated C api with opaque data types and private functions that are nonetheless shared between source files without redundant extern declarations..