Gettext issue (files missing?)

Hi.

On XP, I run the following command: gem install gettext I choose 12 (because that's the version we're working with and I'm windows), so it's supposed to install gettext1.0.5. The problem is, when I run "rake updatepo" in for my app, I get: "No such file or directory - msgmerge" And sure enough, there's no such thing anywhere on my computer. Is there anything I need to download?