Sorry for posting to the developer list. I intended it to go to jamboost but I did not manage to get through. I would be glad if someone could instruct me how to subscribe to the jamboost list. --------------------------------------------------- I observed the following behaviour: When building the library, files that are included by e.g. #include <<boost/config.hpp> obviously are not in the list of dependant files. Consequently when one of such files has been edited no recompilation is beeing triggered. While this behaviour is fine with user programs it is unfortunate when compiling (and working) on the library itself. I even suspect that updating such files from sourceforege will render the following compile meaningless. I tried this on windows with MSVC 7_1. Any hints? Roland