Missing headers for sysctl stuff on OSX
diff --git a/src/sysinfo.cc b/src/sysinfo.cc
index 5a4777a..fac2653 100644
--- a/src/sysinfo.cc
+++ b/src/sysinfo.cc
@@ -21,7 +21,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <sys/resource.h>
+#include <sys/sysctl.h>
 #include <sys/time.h>
+#include <sys/types.h>
 #include <unistd.h>
 
 #include <iostream>