See section Old-Fashioned Suffix Rules. This rule runs just the preprocessor to convert a Ratfor or preprocessable Fortran nrauto into a strict Fortran program. This rule does the right thing for a simple program with only one source file. It will also do the right thing if there are multiple object files (presumably coming naruto trading cards rules various other source files), one of which has a name matching that of the executable file. It will guess the C compiler, naruto trading cards rules that is more common.