--- mozjs-68.4.2/mfbt/FunctionTypeTraits.h.orig	2020-12-01 09:23:27.539907533 +0000
+++ mozjs-68.4.2/mfbt/FunctionTypeTraits.h	2020-12-01 09:08:14.179410222 +0000
@@ -10,6 +10,7 @@
 #define mozilla_FunctionTypeTraits_h
 
 #include <tuple>
+#include <cstring>
 
 namespace mozilla {