[FFmpeg-user] ./configure --enable-shared --prefix=/usr/local/ffmpeg error

[humingyin]

root at ubuntu:/home/humy/ffmpeg# ./configure --enable-shared --prefix=/usr/local/ffmpeg
yasm not found, use --disable-yasm for a crippled build
If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-user at mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solving the problem.
root at ubuntu:/home/humy/ffmpeg# 
2011-12-21 



humingyin