Hi all I have a warning message when i compile my application. /usr/include/boost/archive/detail/oserializer.hpp:118: attention : unused parameter 'flags' /usr/include/boost/archive/detail/iserializer.hpp:126: attention : unused parameter 'flags' This is not really important but it's not really serious to have warning in the compilation. I see in Boost CVS that the "flags" variable is not yet commented. Why didn't do it? David Callu