dependency tracking history

[Tom Tromey]

Last night I wrote a history of the automatic dependency schemes used
in Automake.  I've checked it in to the Automake web pages.  Read it
here, if you're interested:

    http://sources.redhat.com/automake/dependencies.html

Teaser: it turns out that every dependency tracking scheme (not only
including our current one, but also including any other one I've ever
seen in use) has a flaw.  Details in the paper.

Tom