[FIX] added chrono header to builders_gpu.hpp file

mencagli · mencagli · commit 535ec37d61be · 2021-11-28T10:09:15.000+01:00
diff --git a/wf/builders_gpu.hpp b/wf/builders_gpu.hpp
@@ -29,6 +29,7 @@
 #define BUILDERS_GPU_H
 
 /// includes
+#include<chrono>
 #include<meta.hpp>
 #include<meta_gpu.hpp>
 #include<basic_gpu.hpp>
