Hello All! Can you help me with explanation: gcc 3.2 (mingw) Folowing sources - which builded in DLL in header file --------------------- calss CF1Variant { public CF1Variant& CF1Variant::operator=(CF1Variant const& var); CF1Variant& operator=(const CF1Reference& ref); CF1Variant& operator=(const CF1ConstReference& ref); } Library compiled and builded but when I use in another source (another DLL ) CF1Variant t1(tag); CF1Variant t2(tag); t1=t2; compiled fine , but in Linking step I have got follows error (???) undefined reference to `CF1Variant::operator=(CF1Variant const&)' Can you help me - how should string in def file for my CFVariant library for I can check - is this operator properly esported ? In present DEF file I CAN't seee any poits for this operator ....