The latest development version of SDL is available via Subversion.
Subversion allows you to get up-to-the-minute fixes and enhancements;
as a developer works on a source tree, you can use svn to mirror that
source tree instead of waiting for an official release. Please look
at the Subversion website ( http://subversion.tigris.org/ ) for more
information on using svn, where you can also download software for
MacOS, Windows, and Unix systems.

  svn checkout svn://libsdl.org/trunk/SDL

When you check out a fresh copy of SDL out via svn, you need to
generate the files used by make by running the "autogen.sh"
script, which will run aclocal, automake, autoconf and then
run configure.

There is a web interface to svn at http://www.libsdl.org/wsvn