> I'm not using zsh on this machine. Unless you're saying tcsh is zsh? Also
> I've built gpg on zsh on Linux. Either way it doesn't seem like zsh has
> anything to do with this problem...
MacOS X apparently uses zsh as The Bourne Shell, /bin/sh. The way it appears to be configured, is not compatible with Bourne shell, and as such causes all sorts of problems when running configure scripts.