Index: lib/datetime.cpp
==================================================================
--- lib/datetime.cpp
+++ lib/datetime.cpp
@@ -30,10 +30,11 @@
 
 #include "datetime.h"
 #include "stream2string.h"
 
 #include <iomanip>
+#include <cstring>
 
 #include <stdlib.h>
 #include <time.h>
 
 using namespace std;
@@ -51,11 +52,11 @@
 	localtime_r(&t, ptm);
 #else
 	// No explicitly thread-safe localtime() replacement found.  This
 	// may still be thread-safe, as some C libraries take special steps
 	// within localtime() to get thread safety, such as TLS.
-	memcpy(ptm, localtime(&t), sizeof(tm));
+	std::memcpy(ptm, localtime(&t), sizeof(tm));
 #endif
 }
 
 
 std::ostream& operator <<(std::ostream& os, const Date& d)