Index: External/CUDA/test_round.cu
===================================================================
--- External/CUDA/test_round.cu
+++ External/CUDA/test_round.cu
@@ -8,6 +8,7 @@
 
 #include <iostream>
 #include <cassert>
+#include <stdio.h>
 
 // Test the implementation of llvm intrinsic round. In particular, when the
 // source is equidistant between two integers, it rounds away from zero.