--- a/src/config.h.in
+++ b/src/config.h.in
@@ -8,6 +8,9 @@
 
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
+
+/* Set to 1 if the setSourceIndex function is found in libupnpp */
+#undef HAVE_SETSOURCEINDEX_IN_LINN
 
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H