--- include/assimp/Hash.h.orig	2022-09-08 13:13:43.000000000 -0500
+++ include/assimp/Hash.h	2022-09-25 11:46:04.000000000 -0500
@@ -49,6 +49,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <cmath>
+#include <cstdlib>
 
 // ------------------------------------------------------------------------------------------------
 // Hashing function taken from