Hello, In my Boost.Process prototype, I have a custom class to encapsulate errors coming from system calls and other functions from the underlying OS. For the record, it is here: https://boost-consulting.com:8443/trac/soc/browser/boost/soc/2006/ process/trunk/boost/process/exceptions.hpp?order=name I'd like to drop this custom class and instead use the ones provided by the recently introduced Boost.System. However, Boost.System is a binary library, while Boost.Process is currently a header-only library. Personally, I'd prefer to keep it that way if possible because it is much easier to use it in third-party code. So my question is... why is Boost.System not a header-only library? Could it be changed to be so? Thank you. PS: Maybe I should simply discard the goal of providing Boost.Process as a header-only library because I have the same problem with Boost.Filesystem... But well, that's a different issue that doesn't belong to this thread ;-) -- Julio M. Merino Vidal <jmmv84@gmail.com>