Install latest SDL from http://www.devolution.com/~slouken/SDL
Install latest smpeg from http://www.lokigames.com/development/smpeg.php3
Install avifile from http://avifile.sourceforge.net/ (CVS version/0.6.0 only!)
If you do not have the QT libraries or do not want the aviplay binary built
of avifile, the configure script for avifile can be called as follows:
./configure --enable-qt=no --with-win32-path=/usr/local/Xtheater/win32 
	--enable-sdl --enable-quiet

After thes requisite libraries have been installed:
see doc/README.GL if you want GL support now..
./configure
make
make install (as root)

And xtheater will be in /usr/local/bin and support files will be in 
/usr/local/Xtheater

You may wish to read the file "README" for some release notes/Xtheater tips.

./configure --help for more options.
