--- /dev/null
+diff --git "a/butteraugli/butteraugli_main.cc" "b/butteraugli/butteraugli_main.cc"
+index f38af1d..ebf3197 100644
+--- "a/butteraugli/butteraugli_main.cc"
++++ "b/butteraugli/butteraugli_main.cc"
+@@ -2,6 +2,7 @@
+ #include <cstdint>
+ #include <cstdio>
+ #include <vector>
++#include <algorithm>
+ #include "butteraugli/butteraugli.h"
+
+ extern "C" {