I have to seek elsewhere and compile myself. Because I only use PinYin for Chinese input, I found a nice XIM compatible solution called sunpinyin, which also supports Windows as well as native OS X. I took the 2nd approach, and it works out fine. Note that when I logged onto ADCs main site and searched for Xcode in developer tools, its link to version was actually broken. It made me consider switching to the iMac desktop, a 4 year old machine that was mostly collecting dust at home. For various reasons, wiping it out with a fresh Linux distro is not an option, so I decide to look for ways of getting back to my usual setup afterall, OS X is Unix. Although there is an X11 app in OS X, it is not as up-to-date as. XQuartz, which also has versions for both Leopard and Snow Leopard. Make sure you install (or re-install) it after updating Xcode.
Version for Leopard. All later versions would require Snow Leopard (OS X 10.6). There are two options for me: Follow the documentation of Macports to download and install Xcode (around 900M which requires ADC (Apple Developer Connection) membership.