Hi Robert, I have seen that you have changed the libs/serialization/build/Jamfile.v2 Some comments on this: 1) The issue not only applies to borland, and not only to serialization. 2) I am running the regressions with a modification to user-config.jam. I.e.: using borland : : : <cxxflags>-Ipath_to_spirit ; This works well, and if the path is not set the compiler will spill out a message, that will inform the user, that another version of spirit is needed. 3) Your change will insist on a SPIRIT_ROOT beeing available, despite the fact that the include already might have been specified correctly for the toolset. 4) Will your change also work with path-constant, set in site-config.jam ? Policy is to get away with environment variables. Thank you, Roland