--- configure.ac	2007/12/02 04:13:53	1.56
+++ configure.ac	2008/01/30 03:56:31	1.57
@@ -163,6 +163,9 @@
     LIBS="-lspeex $LIBS"
     AC_DEFINE(SPEEX, 1, [Speex support is enabled])
   ])
+  AC_CHECK_LIB(speexdsp, speex_preprocess_state_init, [
+  LIBS="-lspeexdsp $LIBS"
+])
 ])
 fi