ibus + compose key in urxvt doesn't work

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https://bbs.archlinux.org – I recently decided to give an IME another shot since I want to learn Japanese. Everything's working fine for entering Japanese and typical English characters, but every now and then I want to use Unicode symbols with my compose key, like é, §, ®, etc. Even with my input method turned off, my compose key doesn't work in urxvt. I looked around the Arch wiki to see if it was a config problem. No dice. Searching on ixquick only landed me on a bugtracker page that seemed to cover it. The fix is supposedly using `ibus-xkbc`. The problem is I couldn't find it in the repos or the AUR (HowTos)