現時点では（version 0.3.1）、macirbを使うときは、LANG=C
で利用する必要があるようなので、以下のようにzshrcでaliasを登録してみました。
~/.zshrc
sh>>
alias macirb='LANG=C macirb'
<<--
これで特に問題なくmacirbを使う事ができます。
ちなみに、require "nkf"をしているRubyスクリプトを
macrubyで実行する場合も、同様にLANGをCにする必要があるようです。
See Also
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