diff -Nur recode-3.6-old/src/argmatch.c recode-3.6/src/argmatch.c
--- recode-3.6-old/src/argmatch.c	2008-05-27 15:17:09.000000000 +0300
+++ recode-3.6/src/argmatch.c	2008-05-27 15:18:30.000000000 +0300
@@ -18,6 +18,8 @@
 /* Written by David MacKenzie <djm@ai.mit.edu>
    Modified by Akim Demaille <demaille@inf.enst.fr> */
 
+#include <stdlib.h>
+
 #include "argmatch.h"
 
 #include <stdio.h>