Hello everyone, I make a library using Boost Program Options (version 1.44). I have some "Undefined symbols" (for multiple_occurrences::get_option_name() and validation_error::what()) when I try to use my library with Boost version 1.5x. Does anyone know why those two methods disappear? Thank you! -- *Romain LEGUAY* Ingénieur Jeune Diplômé Projet Realopt A33-IMB Bureau 270 Tel: +33 5 40 00 21 35