HydraExpress-generated code depends on classes in the Rogue Wave Services Framework (RWSF) Core Library. HydraExpress projects can generate makefiles and Microsoft MSVC project files for the project, and these link in the required libraries automatically. If you are creating your own makefile, the required libraries are rwsf_coretag.ext and rwsf_xmlbindingtag.ext, where tag is the build tag, ending in either 12d for release builds or 15d for debug builds, and ext is the platform-specific library extension. These libraries are located in <installdir>\lib directory.