Begin autotools sanitization sequence by requiring ports to explicitly
specify which version of {libtool,autoconf,automake} they need, erasing
the concept of a "system default".
For ports-in-waiting:
USE_LIBTOOL=YES -> USE_LIBTOOL_VER=13
USE_AUTOCONF=YES -> USE_AUTOCONF_VER=213
USE_AUTOMAKE=YES -> USE_AUTOMAKE_VER=14
Ports attempting to use the old style system after June 1st 2004 will be
sorely disappointed.
USE_SDL=yes -> USE_SDL=sdl (good examles everywhere)
WANT_SDL/HAVE_SDL instead of exists(localbase/lib/lib...)
See
http://www.freebsd.org/doc/en_US.ISO8859-1/books/porters-handbook/using-sdl.html
for more information on how to use USE_SDL, WANT_SDL and HAVE_SDL.
PR: follow-ups of ports/55494, ports/61877
Submitted by: Edwin Groothuis <edwin@mavetju.org>
