can't load library 'libqt.so.3' 问题！ [复制链接]

安装完QT后运行程序出现 can't load library 'libqt.so.3' 问题！
阅读安装指南有这样的提示：

If you have problems running the example programs, e.g. messages like

     can't load library 'libqt.so.3'

    you probably need to put a reference to the qt library in a
    configuration file and run /sbin/ldconfig as root on your system.
    And don't forget to set LD_LIBRARY_PATH.

请问 configuration file  在哪儿啊？ 需要 添加 什么 参数 呢？
请教啊！