[MPlayer]编译错误。

编译Mplayer时链接错误：
libao2/ao_alsa.o: In function `get_delay':

ao_alsa.c:(.text+0x223): undefined reference to `snd_pcm_forward'
libao2/ao_alsa.o: In function `init':

ao_alsa.c:(.text+0x17e9): undefined reference to `snd_pcm_sw_params_get_boundary'

解决办法：
apt-get install libasound2-dev