Hi all, Using "uuid_alt_v13_pod.zip": 1) It seems that some namespace function definitions in uuid.hpp violate the ODR, specifically the ones lacking inline keyword. This is one of the errors I get using Apple's g++-4.0 when including uuid.hpp in two different source files: ld: duplicate symbol boost::uuids::operator>=(boost::uuids::uuid const&, boost::uuids::uuid const&) If I add inline to the aforementioned function definitions, then the linker errors go away, which makes since. After some digging around, this issue was discussed beginning with: http://lists.boost.org/Archives/boost/2007/05/122479.php but seems to have cropped back up. Examples are: "uuid/boost/uuid/uuid_io.hpp" and the files under "uuid/libs/uuid/test/"2) Also some files in the package are pseudo-randomly sprinkled with Ctrl-M characters, as if someone edited them with two different editors.. -Mostafa