scim doesn't work after glibc 2.5 being emerged
I am not sure about the cause at this moment. Thanks to fcitx, I still can input Chinese. However I can't get used to it, there is some difference between the two input methods. For example in fcitx you need to press 2 keys when switching between English/Chinese, while in scim you just need to press "shift", which is the same as in MS Pinyin.
Anyway, I have come back to scim (1.4.4). So good bye to fcitx!