diff -rupN a/webm2pes.cc b/webm2pes.cc
--- a/webm2pes.cc	2021-03-05 09:42:49.952504300 -0800
+++ b/webm2pes.cc	2021-03-05 09:43:10.772681500 -0800
@@ -7,6 +7,7 @@
 // be found in the AUTHORS file in the root of the source tree.
 #include "webm2pes.h"
 
+#include <cstring>
 #include <vector>
 
 namespace {
