We believe that your issue has been closed by the upload of
Version 0.2.17 of grml-etc-core from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.7
Date: Fri, 19 Jan 2007 19:27:43 +0100
Source: grml-etc-core
Binary: grml-etc-core
Architecture: source all
Version: 0.2.17
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-etc-core - core ecetera files for the grml system
Changes: 
 grml-etc-core (0.2.17) unstable; urgency=low
 .
   * zsh config files: fix handling of check for binaries, thanks
     for reporting to Erich Minderlein, thanks for investigation
     and patch to ft! (Closes: issue80)
Files: 
 6e3103a582463a3c7522c3b7ca5f6244 507 grml optional grml-etc-core_0.2.17.dsc
 c63f7a4ad001e4a40c5b8fb6d332aa8f 71594 grml optional grml-etc-core_0.2.17.tar.gz
 b9c652a466124e0254602c2aa95f30bb 74316 grml optional grml-etc-core_0.2.17_all.deb

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damn, file upload failed...

Both config files use [[ -x =binary_name ]] tests.
If this is done, you get ugly error message, if the binary isn't there,
because in that case the '=binary_name' expansion fails, which is why
zsh complains about this. Patch attached.