Yann Leprince      2010-03-31 11:07:53 PDT

Please add a #serial line as below to sdl.m4 and increase the serial number
with each revision of this file. This allows using aclocal --install, thereby
enabling automatic updating of sdl.m4 in SDL-based packages that distribute it.

# serial 1

The complete documentation and rationale for #serial can be found in the
Automake documentation:
<http://www.gnu.org/software/automake/manual/html_node/Serials.html>.