diff -urN ptlib-2.12.4/configure.ac ptlib-2.12.4.new/configure.ac
--- ptlib-2.12.4/configure.ac	2013-06-21 07:02:48.000000000 +0200
+++ ptlib-2.12.4.new/configure.ac	2013-06-24 11:51:18.356368722 +0200
@@ -1735,6 +1735,7 @@
                        PTLIB_CFLAGS="$PTLIB_CFLAGS ${SDL_CFLAGS}"
                        LDFLAGS="$LDFLAGS `pkg-config --libs sdl`"
                       ],[HAS_SDL=])
+    ENDLDLIBS="$ENDLDLIBS ${SDL_LIBS}"
   fi
 fi
 AC_SUBST(HAS_SDL)