Why doesn't autoconf like our /bin/sh?

[Stefan Farfeleder]

On Sun, Mar 09, 2008 at 03:27:12PM -0400, Mike Meyer wrote:
> I've stumbled on to an obscure problem with autoconf 2.61, and I'm not
> sure quite what to do with it. I've already sent mail to the autoconf
> folks, but I'd like to understand what's going on.
> 
> The problem is that, on a FreeBSD system with only /bin/sh and the
> ports zsh as installed shells, if you have SHELL set to zsh when
> invoking the autoconf-generated configure script, the script produces
> a broken Makefile. It doesn't generate an error, it just complains
> that:

Can you please retry?  /bin/sh now supports expanding $LINENO which was
often the reason for configure not liking it.

Stefan