--- mrtg-2.17.10/configure.bak	2025-10-17 20:44:24.878718603 +0100
+++ mrtg-2.17-10/configure	2025-10-17 20:44:40.343747835 +0100
@@ -3664,6 +3664,7 @@
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdio.h>
+#include <stdlib.h>
             int main()
             {
                 long long b, a = -0x3AFAFAFAFAFAFAFALL;