--- old/src/hotspot/share/runtime/os.hpp	2018-10-04 14:38:58.375316188 +0530
+++ new/src/hotspot/share/runtime/os.hpp	2018-10-04 14:38:58.247316189 +0530
@@ -539,7 +539,7 @@
   static char* do_you_want_to_debug(const char* message);
 
   // run cmd in a separate process and return its exit code; or -1 on failures
-  static int fork_and_exec(char *cmd);
+  static int fork_and_exec(char *cmd, bool use_vfork_if_available = false);
 
   // Call ::exit() on all platforms but Windows
   static void exit(int num);