--- a/CMakeLists.txt	Wed Nov 28 20:17:53 2012 +0200
+++ b/CMakeLists.txt	Sat Nov 07 22:36:02 2015 +0200
@@ -58,6 +58,8 @@
 	int main (void) { return 0; }
 	#endif
 	" HAVE_MCABBER_COMPLETION_FLAGS)
+include(CheckSymbolExists)
+check_symbol_exists(COMPL_CARBONS mcabber/compl.h HAVE_COMPL_CARBONS)
 link_directories(${GLIB_LIBRARY_DIRS}
 				 ${GMODULE_LIBRARY_DIRS}
 				 ${MCABBER_LIBRARY_DIRS})