UIM configuration changed after uim-0.4.4.

# Before 0.4.4:
GTK_IM_MODULE=uim-anthy; export GTK_IM_MODULE
XMODIFIERS=@im=uim-anthy; export XMODIFIERS
# After 0.4.4:
GTK_IM_MODULE=uim; export GTK_IM_MODULE
XMODIFIERS=@im=uim; export XMODIFIERS

And specify your favorite input method to your ~/.uim
(define default-im-name 'anthy)

SEE ALSO:
in English:
http://freedesktop.org/pipermail/uim/2004-October/000659.html
in Japanese:
http://lists.sourceforge.jp/mailman/archives/anthy-dev/2004-October/001135.html