diff -Naur nistp224-0.75.orig/src/main.c nistp224-0.75/src/main.c
--- math.orig/nistp224-0.75/src/main.c	2008-01-26 21:56:34.000000000 +0100
+++ math/nistp224-0.75/src/main.c	2008-01-26 22:05:17.000000000 +0100
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include "nistp224.h"
 
 unsigned char e[28];
diff -Naur nistp224-0.75.orig/src/nistp224-56.c nistp224-0.75/src/nistp224-56.c
--- math.orig/nistp224-0.75/src/nistp224-56.c	2008-01-26 21:56:34.000000000 +0100
+++ math/nistp224-0.75/src/nistp224-56.c	2008-01-26 21:57:10.000000000 +0100
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include "nistp224.h"
 
 unsigned char e[28];