Why doesn't autoconf like zsh? (was: Why doesn't autoconf like our /bin/sh?)

[Greg 'groggy' Lehey]

On Sunday,  9 March 2008 at 15:27:12 -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:
>
> ...
>
> Setting SHELL to /bin/sh, or unsetting it, also solves this.

This is pretty clear that this is a zsh issue, either because of bugs
in zsh or (more likely, I'd guess) in autoconf.

Greg
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