These are the instructions for enabling Dirac support in Mplayer source
code.

1. Download Dirac 0.9.1 from
   http://sourceforge.net/projects/dirac/

2. Unpack the Dirac source
   tar xvzf dirac-0.9.1.tar.gz

3. Build and Install

   cd dirac-0.9.1
   ./configure 
   make
   make install

   The last step installs the Dirac share encoder and decoder libraries in
   /usr/local/lib (which is the default install point).
   
3. Download the MPlayer-1.0rc2
   http://www.mplayerhq.hu/design7/dload.html

4. Unpack the source
   tar xvjf MPlayer-1.0rc2.tar.bz2

5. Apply the patch

   cd  MPlayer-1.0rc2
   patch -p1 < MPlayer-1.0rc2_dirac-0.9.x.patch

6. Build and Install
   
   ./configure
   make 
   make install

   (If Dirac support is enabled, HAVE_DIRAC is defined in config.h)