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This seems kinda hackish but I had to add the following line to my .zshrc file to get zcalc and zmv working on leopard:
Code:
autoload /usr/share/zsh/4.3.4/functions/*(:t)

It's interesting that the stock leopard has some of those built-ins (checkmail, run-help, zcalc) referencing the wrong path for the zsh interpreter (/usr/local/bin/zsh). I'm not sure if it really makes difference in this case though.
 
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