When e.g. LC_CTYPE is set in .zshrc with 'export LC_CTYPE=foobar', the
variable is not exported. The variable is visible if you type 'typset' at
the prompt, but not when you give the command 'export'. The variable is
correctly set if declared in an interactive shell, e.g. with 'export
LC_CTYPE=foobar' at the prompt.
The bug is described at http://va.debian.org/Bugs/db/59/59326.html.
Should be fixed in next rawhide (3.0.7-5) - .zshrc isn't where you are supposed
to set variables, though: .zshenv is better suited for that.