Hi Qihong,

Under your link: there is a package "qt-everywhere-opensource-src-4.8.6.tar.gz". You can unzip this package by "tar zxvf qt-everywhere-opensource-src-4.8.6.tar.gz". Enter in unzipped folder, you can build Qt by "./configure", "make", and "make install". By default, it will install Qt to /usr/local. If you prefer other location, please parse "--prefix=/your_preferred_install_location" to the command "configure".

After you successfully build Qt, type "qmake --version" to test Qt version.

Hope this helps.

Thanks,
Yang