Info: c++ and fortran linking in qtisas::compile. In last few years one of direction of development of FITTING tools is “block” structure of functions. “Block” structure means creation of a single file with self-sufficient model/function as a file with few lines of comments containing information about this function. You could find menu-buttons “SASVIEW”, “QtiKWS/QtiSAS”, and “fortran” for different types of such functions. PDF file below describes how could be integrated FORTRAN function in a nice way in qtiSAS.