Single-suffix rules broken?

[Ludovic Courtès]

Hi,

I'm trying to use the following single-suffix rule:

  .SUFFIXES = .in

  .in:
          echo dot-in

My understanding is that the rule should be triggered whenever there
exists a file whose name is equal to the target name plus the `.in'
suffix.  For instance, "make foo" should trigger the rule when `foo.in'
exists.  However, that does not happen.

Am I missing something or are single-suffix rules somehow broken?

Thanks,
Ludovic.