+AC_ARG_ENABLE([adrian-aec],
+ AS_HELP_STRING([--enable-adrian-aec], [Enable Adrian's optional echo canceller]))
+AS_IF([test "x$enable_adrian_aec" != "xno"],
+ [HAVE_ADRIAN_EC=1])
+AM_CONDITIONAL([HAVE_ADRIAN_EC], [test "x$HAVE_ADRIAN_EC" = "x1"])
+
+