diff -ruN gnokii-0.6.31-orig/configure gnokii-0.6.31/configure
--- gnokii-0.6.31-orig/configure	2011-12-02 08:54:03
+++ gnokii-0.6.31/configure	2023-10-19 12:15:35
@@ -19127,6 +19127,7 @@
 /* end confdefs.h.  */
 
 #include <stdio.h>
+#include <stdlib.h>
 
 int main()
 {
@@ -19166,6 +19167,7 @@
 
 #include <stdio.h>
 #include <stdarg.h>
+#include <stdlib.h>
 
 int doit(char *buf, int len, const char *s, ...)
 {