Naming convention for included make files?

[Sean Hammond]

Hi,

I understand that `Makefile` is the conventional name for a root make file, but 
is there a naming convention for files included using the `include` directive?

>From examples in the manual I'd guess that it's `foo.mk` (all lower-case, .mk 
>filename extension).

Alternative suggestions that I've received are `makefile_foo.mk` or 
`MakefileFoo.mk` (which seem redundant to me) or `Makefile.foo` (which works 
but seems like a poor idea to me because `foo` could appear to be the file 
type). The argument for naming them all `Makefile*` is that they'll sort next 
to each other in file listings.

Thanks