--- a/Python/strdup.c	2021-06-28 09:26:18.000000000 +0100
+++ b/Python/strdup.c	2021-08-20 09:26:36.443055850 +0100
@@ -1,5 +1,7 @@
 /* strdup() replacement (from stdwin, if you must know) */
 
+#include "Python.h"
+
 char *
 strdup(const char *str)
 {