--- configure	2010-09-25 17:19:29.000000000 +0800
+++ configure	2025-05-21 21:07:26.000000000 +0800
@@ -4838,6 +4838,7 @@
 /* end confdefs.h.  */
 
 #include <ctype.h>
+#include <stdlib.h>
 #ifdef HAVE_WIDEC_H
 #include <widec.h>
 #endif