3.4 Fortran build process

In order to be able to reference GNU libmatheval procedures from Fortran code, declarations of procedures that will be used should be repeated, like demonstrated by Fortran sample program (once when interface upgraded to Fortran 90, modules and use statement will be employed here). Command for compilation Fortran program using library and stored in file example.f using GNU Fortran 77 compiler would look like (again supposing that library is installed using default prefix /usr/local/lib):

f77 example.f -ff90 -ffree-form -L/usr/local/lib -lmatheval -o example