>>>>> "Tom" == Tom Tromey <[EMAIL PROTECTED]> writes: Martin> And then, for full functionality, automake should use that Martin> variable in generating rules, right? Martin> .c.o: $(CC) $(CFLAGS) ... @CC_C_O@ $< Tom> This won't be sufficient. Automake will need more information. Such as? Tom, have you taken a look at the source file extension problem? It seems we don't know what sane extension we could use to compile C++ source files. For instance VC++ rejects .cc. ISTR that Martin said something about the Fortran source file extensions too. What would Automake (or missing) need to know?