--- old/src/hotspot/os/windows/gc/z/zSyscall_windows.hpp	2019-12-11 12:53:24.957977761 +0100
+++ new/src/hotspot/os/windows/gc/z/zSyscall_windows.hpp	2019-12-11 12:53:24.697973451 +0100
@@ -45,6 +45,8 @@
   static UnmapViewOfFile2Fn   UnmapViewOfFile2;
 
   static void initialize();
+
+  static bool is_os_supported();
 };
 
 #endif // OS_WINDOWS_GC_Z_ZSYSCALL_WINDOWS_HPP