GCC 4.7 needs cstdio

diff --git a/src/build.h b/src/build.h
index 4859c29..5e26bbb 100644 (file)
--- a/src/build.h
+++ b/src/build.h
@@ -21,7 +21,7 @@
 #include <queue>
 #include <vector>
 #include <memory>
-using namespace std;
+#include <cstdio>
 
 #include "exit_status.h"
 #include "metrics.h"