Package: uim-gtk3

"uim-gtk3" package binaries on Debian:

/usr/bin/uim-im-switcher-gtk3 /usr/bin/uim-input-pad-ja-gtk3 /usr/bin/uim-pref-gtk3 /usr/bin/uim-toolbar-gtk3 /usr/bin/uim-toolbar-gtk3-systray

You may install this package on Debian with apt-get install uim-gtk3