转载自：http://my.oschina.net/lieefu/blog/505363

如何在Qt5中切换汉字输入法，完美解决Qt Creator使用fcitx输入法录入汉字问题，解决办法是自己编译fcitx-qt5，安装部署 libfcitxplatforminputcontextplugin.so

在Qt5.3之前，我发布过解决办法 解决Qt5 Creator无法切换输入法（fcitx），不能录入汉字问题，Qt5.4以及Qt5.5，旧办法失效，原因是Qt5.4后对之前Qt5版本不再二进制兼容，libfcitxplatforminputcontextplugin.so 需要编译最新的fcitx-qt5，看fcitx-qt5是在1.0.3版本时解决的这个问题，写本篇博客时，我git clone到的是1.0.4版本。

编译fcitx-qt需要cmake，安装cmake命令，如果已经安装，请略过。
sudo apt-get install cmake

安装 fcitx-libs-dev

sudo apt-get install fcitx-libs-dev

设置qmake的环境变量：

export PATH="/home/lieefu/Qt5.5.0/5.5/gcc_64/bin":$PATH

下载fcitx-libs源码：

git clone git@github.com:fcitx/fcitx-qt5.git

编译方法：

cd fcitx-qt5
cmake .
make
sudo make install

最后把编译得到 libfcitxplatforminputcontextplugin.so 拷贝到 Qt5.5安装目录的 Tools/QtCreator/bin/plugins/platforminputcontexts

大功告成！

CMake Error at CMakeLists.txt:8 (find_package):
Could not find a package configuration file provided by "ECM" (requested
version 1.4.0) with any of the following names:
ECMConfig.cmake
ecm-config.cmake
Add the installation prefix of "ECM" to CMAKE_PREFIX_PATH or set "ECM_DIR"
to a directory containing one of the above files.If "ECM" provides a
separate development package or SDK, be sure it has been installed.
-- Configuring incomplete, errors occurred!

遇到上述错误处里方法：
这个页面 https://launchpad.net/ubuntu/+source/extra-cmake-modules/1.4.0-0ubuntu1 下载 extra-cmake-modules_1.4.0.orig.tar.xz
解压后:
cd extra-cmake-modules-1.4.0
cmake .
make
sudo make install

CMake Error at /home/lieefu/Qt5.5.0/5.5/gcc_64/lib/cmake/Qt5Gui/Qt5GuiConfigExtras.cmake:9 (message):
Failed to find "GL/gl.h" in "/usr/include/libdrm".

处里方法：
sudo apt-get install libgl1-mesa-dev libglu1-mesa-dev

-- Found PkgConfig: /usr/bin/pkg-config (found version "0.26")
-- Could NOT find XKBCommon_XKBCommon (missing:XKBCommon_XKBCommon_LIBRARY XKBCommon_XKBCommon_INCLUDE_DIR)
CMake Error at /usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108 (message):
Could NOT find XKBCommon (missing: XKBCommon_LIBRARIES XKBCommon) (Required
is at least version "0.5.0")

处里方法：
wget http://xkbcommon.org/download/libxkbcommon-0.5.0.tar.xz
tar xf libxkbcommon-0.5.0.tar.xz
./configure --prefix=/usr --disable-x11
make
sudo make install

编译libxkbcommon用到yacc，如果没有这个命令，会遇到下面的错误，yacc在 bison软件包中
sudo apt-get install bison

YACC src/xkbcomp/parser.c
./build-aux/ylwrap: line 176: yacc: command not found
make: *** [src/xkbcomp/parser.c] Error 127