N.o is made automatically from N.f, N.F or N.r by running the Fortran 77 compiler. The precise command used is as follows:
$(F77) -c $(AM_FFLAGS) $(FFLAGS)
$(F77) -c $(DEFS) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS)
$(AM_FFLAGS) $(FFLAGS)
$(F77) -c $(AM_FFLAGS) $(FFLAGS) $(AM_RFLAGS) $(RFLAGS)