error_condition2.DIFF

diff --git a/engines/utilities/engine_error.cc b/engines/utilities/engine_error.cc
index 7fc1f63..e16d299 100644
--- a/engines/utilities/engine_error.cc
+++ b/engines/utilities/engine_error.cc
@@ -63,6 +63,11 @@ public:
             return iter->second;
         }
     }
+
+    std::error_condition default_error_condition(int code) const NOEXCEPT override {
+        return std::error_condition(code, *this);
+    }
+
 };
 
 const std::error_category& cb::engine_error_category() NOEXCEPT {