diff -r 5f7151e6de85 -r 15635d8b17e0 mercurial/bdiff_module.c
--- a/mercurial/bdiff_module.c	Thu Oct 13 13:22:40 2016 +0200
+++ b/mercurial/bdiff_module.c	Thu Oct 13 13:27:14 2016 +0200
@@ -17,6 +17,7 @@
 
 #include "bdiff.h"
 #include "bitmanipulation.h"
+#include "util.h"
 
 
 static PyObject *blocks(PyObject *self, PyObject *args)