I think that you should try to generate a user configuration header as described in
http://www.boost.org/libs/config/config.htm
(gcc.hpp is part of Boost.Config.)
Thanks for the pointer. Actually, I "abused" it to work by commenting the error-if-gcc<2.9 out of gcc.hpp and taking out the namespace stuff (gcc 2.7 does not know about namespaces). Do you see any problems with doing so? In any case, I will look at the config.htm to try to find a more civilized solution. Thanks, Nik ----- /\ |\ /| ------ ----/\ | / \ | \ / | | | / \ | / --- \ | \/ | | | / \ ----- / \ | | |------| ----/ \----