Hi, the current version of GiNaC requires a new hack to make it work with MSVC. The problem is lst::info(). It is never called when GiNaC is compiled with MSVC, instead, basic::info() gets called which leads to exceptions being thrown by code like: if (!eqns.info(info_flags::list)) { throw(std::invalid_argument("lsolve(): 1st argument must be a list or an equation")); The only work-around I could find was to move the definition of lst::info() from the .cpp file to the .h file (please don't ask me why this should make a difference). I know it's a stupid hack, but in any case, I attach the modified lst.h and lst.cpp in case you want to include it in a future release of GiNaC. Jan