autoconfiscation -- questions about make usage

[Nathanael Nerode]

On Tue, 29 Jan 2002, Joe Buck wrote:

> 
> > All right.  I'm doing a lot of makefile rewriting as part of my
> > autoconfiscation of the top level directory.  I need to know what GNU make
> > constructs I'm allowed to use.  Do I need to stick to
> > lowest-common-denominator make?
> 
> You don't need to use "least common denominator", but ideally any
> Posix-compliant make (e.g. BSD Make) should work.

Hmm... where the heck do I find a free description of what a make has to
do to be POSIX compliant?