QT安装

step 1 安装依赖库，在安装说明的最下面

sudo apt-get install libfontconfig1-dev
libfreetype6-dev libx11-dev
libxcursor-dev libxext-dev
libxfixes-dev libxft-dev
libxi-dev libxrandr-dev
libxrender-dev

step 2 下载安装包：
http://download.qt.io/archive/qt/4.8/4.8.6/qt-everywhere-opensource-src-4.8.6.tar.gz
step 3 解压 解包

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gunzip qt-everywhere-opensource-src-4.8.6.tar.gz # uncompress the archive
tar xvf qt-everywhere-opensource-src-4.8.6.tar # unpack it

step 4 配置生成MakeFile

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./configure

./configure

//配置的时候可能出现make: g++: Command not found，这时候就可以安装sudo apt-get install build-essential 装好GCC开发环境就好了

step 5 构建

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make

step 6 安装

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make install

step 7 配置环境变量

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PATH=/usr/local/Trolltech/Qt-4.8.6/bin:$PATH
export PATH

step 8 创建连接

sudo ln -s /usr/local/Trolltech/Qt-4.8.6/bin/qmake /usr/lib/i386-linux-gnu/qt4/bin/qmake

参考：http://qt-project.org/doc/qt-4.8/install-x11.html