$NetBSD$

build with gcc4.3

--- lib/signal_op.cpp.orig	2006-05-10 18:01:12.000000000 +0000
+++ lib/signal_op.cpp
@@ -12,6 +12,7 @@
 // DATE CREATED: 1/12/06
 
 
+#include <cstdlib>
 #include <math.h>
 #include "signal_op.h"
 #include "AFLIB/aflibConverter.h"
