Currently, gnome-session has the necessary pre-processor checks to compile with
or without support for esound in its code. However, esound ends up being
required unconditionally since, for example, configure.in calls AC_MSG_ERROR if
the 'esd' executable is not found.

This could be improved a little bit. I think it would be nice to provide a
switch in 'configure' to enable/disable support for esound. I've created a patch
for this against CVS HEAD, which I've tested it without problems so far.

With the patch, the default behaviour is to enable esound support, but it gives
the option to disable it. I'll attach it here in case there's interest in this.
Thanks.