That makes a lot of sense (at least to me), of course. But, as Volodya suggests, there is no guarantee that "upstream Boost" keeps (ABI) compatibility from a given version to another. Now, as apparently "upstream Boost" will not make any release with a sub-minor version not equal to 0, it should be safe to assume that "1.41" == "1.41.0", and therefore that "1.41" be compatible with "1.41.x" (since x=0).

Denis