AS_IF([test "x$with_oss" = "xyes"], [systems="$systems oss"])
AS_IF([test "x$with_core" = "xyes"], [systems="$systems core"])
AS_IF([test "x$with_asio" = "xyes"], [systems="$systems asio"])
-AS_IF([test "x$with_ds" = "xyes"], [systems="$systems ds"])
+AS_IF([test "x$with_dsound" = "xyes"], [systems="$systems ds"])
AS_IF([test "x$with_wasapi" = "xyes"], [systems="$systems wasapi"])
required=" $systems "