--- x265_4.1/source/x265cli.cpp.orig
+++ x265_4.1/source/x265cli.cpp
@@ -27,6 +27,7 @@
 
 #include "x265cli.h"
 #include "svt.h"
+#include <alloca.h>
 
 #define START_CODE 0x00000001
 #define START_CODE_BYTES 4