In article <20030906065210.5AA1DB004@cvs.netbsd.org>,
Simon J. Gerraty <sjg@netbsd.org> wrote:

>Make empty() consider an undefined variable as empty,
>rather than throw a syntax error.

I had considered doing this many times, but it needs to be coordinated
with the other BSD's, otherwise we'll end up with makefiles that run
only in our version of make.

christos