输入法相关环境变量
这个页面介绍了以下环境变量的含义。你不需要理解他们来使用Fcitx，但是以下内容可能会在你遇到问题是帮助你检查哪里出了问题。
XMODIFIERS
这个变量仅影响 XIM。格式为
XMODIFIERS=@im=<xim 服务器名称>
当 XIM 服务器启动时，他会注册一个应当在这里使用的名称。这个名称不能和其他 XIM 服务器相同，因此你无法在同一个 X 服务器下运行两个 Fcitx。通常情况下，Fcitx 的 XIM 服务器名称为 fcitx。
因此对于 Fcitx 来说这个设置应当为
XMODIFIERS=@im=fcitx
在非 CJK 语言环境中，如果这个环境变量没有设置，一些程序中 XIM 将无法工作，这意味这你最好总是设置了这个环境变量。并且 XIM 也需要你有正确的语言环境，这意味着你的语言必须在下面的命令的输出当中
locale -a
你可以通过以下命令检查你当前的语言环境
locale
In order to use XIM, your locale also must NOT be C or POSIX.
GTK_IM_MODULE
This will override the system automatic gtk im module selection. By default gtk select im module by the language provided by im module. Fcitx declares that it support "zh:ja:ko:*". And this information will be record in a file, on most linux system it's /etc/gtk-2.0/gtk.immodules and /etc/gtk-3.0/gtk.immodules, or suffixed with -32 or -64.
{{warning|After Debian goes multiarch, they will use different file. The file will be /usr/lib/<arch>/gtk-{2,3}.0/gtk.immodules }} You need to use
gtk-query-immodules-2.0 > <gtk-2.0 immodule file>
to do update for gtk2.
Or if your gtk2 version is newer than 2.24.20, you should use
gtk-query-immodules-2.0 --update-cache
instead just like gtk3.
and
gtk-query-immodules-3.0 --update-cache
to do update for gtk3.
Otherwise new im module will not be recognized.
If no im module specified by GTK_IM_MODULE is found, it will fallback to auto select method.
QT_IM_MODULE
Qt's im module is similar with Gtk, but don't need extra file to recognize. If QT_IM_MODULE is not specified, qtconfig (Ubuntu/Debian/ArchLinux qtconfig-qt4) can be used to configure the default one.
Otherwise it will be override by QT_IM_MODULE.
LC_CTYPE
System locale should not be changed in all case. It might brings unpredictable effect.
This should only be used in some case, including emacs and java. Emacs has a historical bug, that under en_US.UTF-8 or similar locale, it will never use XIM (Though emacs is a gtk app, it use XIM). The only way to walkaround this is to use LC_CTYPE to fix this.
For example, to only set this with emacs, run emacs with
LC_CTYPE=zh_CN.UTF-8 emacs
It will not effect the display language of emacs.
Notice, even if you are not using Chinese, you should also try to set it so LC_CTYPE=zh_CN.UTF-8, due to some limitation of XIM.