Hi Francisco, Given your situation, it sounds like the bigger project is using MS Dev Studio's Visual C++. The GCC C++ ABI is not compatible with the MS Dev Studio VC++ ABI. Either the bigger project will need to be compiled with GCC, or your package-made-for-Linux will have to be compiled with MSVC++, or you will have to create a C ABI edge that is the interface from the GCC C++ world to the MSVC++ world. The C ABI is compatible between the two compilers. The C++ ABIs are not compatible. What does "not compatible ABI" mean in this context? The RTTI is incompatible, the exception handling is incompatible, the name mangling is incompatible, the parameter pushing is incompatible, the calling convention is incompatible, the stack clean up is incompatible, the stack unwinding is incompatible, and probably a handful of other catastrophic differences. If you write a C edge, you cannot leak RTTI information, or throw an exception past the C barrier (instant program termination), et cetera. HTH, --Eljay