>>>>> "Tom" == Tom Tromey <[EMAIL PROTECTED]> writes: Akim> What would Automake (or missing) need to know? Tom> Whether the compiler can support the extensions actually in use Tom> by the program. This is an ugly problem because it involves Tom> feedback from Makefile.am to configure. Nope, I think this is a case where we should mandate an extension. For instance, I'm very much for .f77 for Fortran 77, and not .f, so that for instance Automake knows what is the compiler to run if there is F77, F90 and the preprocessed variations. Same for C++, Automake should, IMHO, require a single extension.