--- a/config.h.in	Wed Nov 28 20:17:53 2012 +0200
+++ b/config.h.in	Sat Nov 07 22:36:02 2015 +0200
@@ -36,6 +36,9 @@
 // define this to enable lua-loudmouth log messages handler
 #cmakedefine LLM_LOG_HANDLER
 
+// indicates, whether mcabber have built-in carbons completion
+#cmakedefine HAVE_COMPL_CARBONS
+
 // size of background pipe reading buffer
 #define MLUA_BGREAD_BUFFER   ( ${ML_BGREAD_BUFFER} )