mplayer for Dreambox

For those who don't know, Dreambox is a dvb set-up-box with mipsel processor
and openembedded distribution of linux called enigma2. Dreambox model 800 hd
has one processor Broadcom that play mkv files but not avi. I had thought
that perhaps through software as mplayer I can play avi files. Could someon
help me? Could someone tell me how to compile mplayer for Dreambox? Thx