+#### speex (optional) ####
+
+AC_ARG_WITH([speex],
+ AS_HELP_STRING([--without-speex],[Omit speex (resampling, AEC)]))
+
+AS_IF([test "x$with_speex" != "xno"],
+ [PKG_CHECK_MODULES(LIBSPEEX, [ speexdsp >= 1.2 ], HAVE_SPEEX=1, HAVE_SPEEX=0)],
+ HAVE_SPEEX=0)
+
+AS_IF([test "x$with_speex" = "xyes" && test "x$HAVE_SPEEX" = "x0"],
+ [AC_MSG_ERROR([*** speex support not found])])
+
+AM_CONDITIONAL([HAVE_SPEEX], [test "x$HAVE_SPEEX" = "x1"])
+AS_IF([test "x$HAVE_SPEEX" = "x1"], AC_DEFINE([HAVE_SPEEX], 1, [Have speex]))
+
+AC_SUBST(LIBSPEEX_CFLAGS)
+AC_SUBST(LIBSPEEX_LIBS)
+