关于mpg321的安装问题，求救

finally

./config的时候
提示说缺少libao
找来装上,继续./configure
结果如下:
checking for ao... no
*** Could not run ao test program, checking why...
*** The test program compiled, but did not run. This usually means
*** that the run-time linker is not finding ao or finding the wrong
*** version of ao. If it is not finding ao, you'll need to set your
*** LD_LIBRARY_PATH environment variable, or edit /etc/ld.so.conf to point
*** to the installed location  Also, make sure you have run ldconfig if that
*** is required on your system
***
*** If you have an old version installed, it is best to remove it, although
*** you may also be able to get things to work by modifying LD_LIBRARY_PATH
configure: error: libao needed!
我设置了LD_LIBRARY_PATH,仍然说找不到,另外版本也是要求的,不知道怎么办了
顺便问一下，libao是干什么用的？是不是rh9里本来已经有了？
我又另外装了一个会影响吗？请教一下
再问问，linux下的mp3播放器哪个最简单啊？就是说源码最简单，只要能拨mp3就行，不要求其他功能