I am using SCIM with Fedora Core 5. The method glagoo described should work fine, though you should not have to define LANG or LC_ALL.
The simplest way to get SCIM to work with FC5 is to do the following:
Code:
$ mkdir ~/.xinput.d
$ cd ~/.xinput.d
$ ln -s /etc/X11/xinit/xinput.d/scim default
... and restart GNOME (or KDE). This creates the link called "default" under your home directory, which is picked up by FC5 as it starts X window.
HTH,
Dai