I have uploaded a new version of the guid library to the boost vault (guid_v5.zip). There are only minor bug fixes compared with guid_v4.zip (which no longer exists). The biggest change is that it now compiles cleanly with gcc as well as msvc. There are now 2 guid files in the vault (guid_v3.zip and guid_v5.zip). What do most people do in this situation? Keep both around, or remove the older one? What would people like me to do? Thanks, Andy.