Hi Manuel,

> Nothing should touch the makefile, it seems you have a problem with
> time. Is there something that could make your clock go backward?

The clock is perhaps defect.
It's not a quite brand new computer : "old" Pentium 3.
Do you know how I may determine if the clock is doing any little variation?
During a week, I can see 1 second deviation, but not more.

> Are you working on a NFS-mounted directory ?

No, I am working on a standalone computer, on local (hard-disk) filesystems.

Thanks.

Sylvain.