fix what I had broken while fixing merge conflict.

src/main_utils.cpp

@@ -4,7 +4,7 @@
  *  Created on: May 9, 2016
  *      Author: vlegrand
  */
-
+#include <stdint.h>
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/sysctl.h>