Index: src/include/cassert
===================================================================
--- src/include/cassert	(revision 6a625dec0f64e84a53f9f54b9e3e180ce6265463)
+++ src/include/cassert	(revision a83044fb86cf36e20d6c0f6fbc995d0b814fe1d7)
@@ -19,4 +19,9 @@
 
 #include_next <cassert>
+
+#include <string>
+
+template < typename ... Params >
+std::string toString( const Params & ... params );
 
 #ifdef NDEBUG