As recognized by gentoo (http://bugs.gentoo.org/265872) and archlinux (http://aur.archlinux.org/packages.php?ID=20294) the configure script ignores --disable-xxx-immodule switches whenever the libs needed to build this module is found.
The problem is caused by setting those switch to enabled in the section that is responsible for detecting those libs.
The attached patch fixes this for the configure script of scim-bridge 0.4.16. But of course the configure.ac script has to be adjusted.
Fixed in r334, thanks.