Issue #14387: Do not include accu.h from Python.h.
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 00de597..b9ef0d0 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -1,6 +1,7 @@
 /* List object implementation */
 
 #include "Python.h"
+#include "accu.h"
 
 #ifdef STDC_HEADERS
 #include <stddef.h>