using the date relationship of two older files as a prerequisite

[Brian J. Murrell]

I have a file which is not created by make but is created/updated by an
outside process.  The time stamp on this file will always be some time
in the past.  Let's call this file "O".

I have a target which I want make to build which we'll call "T".  I want
T rebuilt if file O is newer than it was the last time T was built.  But
even though the time on O might be newer than it was the last time T was
built, it will still not be newer than T.

Somehow I need to introduce some kind of time tracking mechanism on O
which triggers a dependency on T, perhaps through a "stamp" file of some
sort but I'm not quite getting my head around it.

Any ideas?

Cheers,
b.

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