--- a/libupnpp/config.h.in
+++ b/libupnpp/config.h.in
@@ -14,6 +14,9 @@
 
 /* Define to 1 if you have the `expat' library (-lexpat). */
 #undef HAVE_LIBEXPAT
+
+/* Define to 1 if you have the `ixml' library (-lixml). */
+#undef HAVE_LIBIXML
 
 /* Define to 1 if you have the `pthread' library (-lpthread). */
 #undef HAVE_LIBPTHREAD