diff -Naur linphone-2.0.1/mediastreamer2/configure.ac linphone-2.0.1-speexdsp/mediastreamer2/configure.ac
--- linphone-2.0.1/mediastreamer2/configure.ac	2007-11-29 22:26:48.000000000 +0100
+++ linphone-2.0.1-speexdsp/mediastreamer2/configure.ac	2008-01-11 12:23:43.000000000 +0100
@@ -280,6 +280,9 @@
 	[try_other_speex=yes]
 )
 PKG_CHECK_MODULES(SPEEX, speex >= 1.1.6, build_speex=yes)
+PKG_CHECK_MODULES(SPEEXDSP, speexdsp >= 1.2beta3,
+    [SPEEX_LIBS="$SPEEX_LIBS $SPEEXDSP_LIBS"]
+)
 AC_SUBST(SPEEX_CFLAGS)
 AC_SUBST(SPEEX_LIBS)
 AM_CONDITIONAL(BUILD_SPEEX, test x$build_speex = xyes )