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.