Index: mttroot/mtt/cc/include/useful-functions.hh
==================================================================
--- mttroot/mtt/cc/include/useful-functions.hh
+++ mttroot/mtt/cc/include/useful-functions.hh
@@ -18,10 +18,11 @@
 const bool true = 1;
 const bool false = 0;
 */
 #else
 #define cast_to_double	static_cast<double>
+using std::pow;
 #endif /* ! __cplusplus */
 
 static inline double
 max (const double x1, const double x2)
 {