deadkey in linux gvim

I have a problem in using us(intl) keyboard. In gvim, the deadkeys
dead_circumflex (shift 6) and dead_breve (altgr+shift 6) does not
work, it is dead but no composition. However dead_grave works.

There is no problem in terminal and vim. geany (gui editor) has the
same problem as in gvim, so I suspect it is a gtk or XIM problem.

I use 64bit lenny, with scim installed, relevant setting in .profile

export XMODIFIERS="@im=SCIM"
# export GTK_IM_MODULE=scim
# export QT_IM_MODULE=scim

Thanks in advance.

--
regards,
====================================================
GPG key 1024D/4434BAB3 2008-08-24
gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3

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