--- a/src/hotspot/share/runtime/os.cpp	Thu Jan 14 11:21:25 2021
+++ b/src/hotspot/share/runtime/os.cpp	Thu Jan 14 11:44:00 2021
@@ -74,6 +74,7 @@
 
 # include <signal.h>
 # include <errno.h>
+# include <alloca.h>
 
 OSThread*         os::_starting_thread    = NULL;
 address           os::_polling_page       = NULL;