Hi, to whomever it may concern: I just downloaded boost 1.30 and tried to recompile my libraries and applications. Now just including the header "linear_congruential.hpp" from the random library produces an internal compiler error: "[C++ Fatal Error] linear_congruential.hpp(113): F1004 Internal compiler error at 0xc4c367 with base 0xc10000" [...] #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS template friend std::basic_ostream& operator<<(std::basic_ostream& os, const linear_congruential& lcg) { os << lcg._x; return os; } template friend std::basic_istream& operator>>(std::basic_istream& is, linear_congruential& lcg) { is >> lcg._x; return is; } #endif [...] As I do not require the streaming facilities I just commented that section out and everything works fine. Maybe not really a solution. Regards Eike P.S: BCB6 with UPD4 was used (BCC32 5.6.4)