./configure --prefix=/usr --confdir=/etc/mplayer &&
make

make install

http://www.live555.com/liveMedia/

http://www.live555.com/liveMedia/public/live.2011.01.24.tar.gz

./genMakefiles linux &&
make &&
cd ..

mv live /usr/lib/mplayer/codecs/

And now it's time to recompile MPlayer and to add

--extra-cflags=-I/usr/lib/mplayer/codecs/live

to the configure call.