commit b6df18997dabe37f4357d977d2dfae07899be5e7
Author: Michał Lipski <tallica@o2.pl>
Date:   Mon May 7 12:48:23 2012 +0200

    Use pkg-config for libsdl detection. (Gentoo #414999)

diff --git a/configure.ac b/configure.ac
index 358f841..cbba0ce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -693,7 +693,7 @@ AC_ARG_ENABLE(sdlout,
  [enable_sdlout=$enableval], [enable_sdlout=yes])
 
 if test $enable_sdlout = yes ; then
-    AM_PATH_SDL(1.2.5, [enable_sdlout=yes], [enable_sdlout=no])
+    PKG_CHECK_MODULES([SDL], [sdl >= 1.2.11], [enable_sdlout=yes], [enable_sdlout=no])
 fi
 
 if test $enable_sdlout = yes ; then