--- avida-2.12.3-src.orig/avida-core/source/analyze/cAnalyzeTreeStats_Gamma.cc	2012-02-02 22:50:29.000000000 +0600
+++ avida-2.12.3-src/avida-core/source/analyze/cAnalyzeTreeStats_Gamma.cc	2012-05-08 19:32:18.793044457 +0600
@@ -27,6 +27,7 @@
 
 #include <math.h>
 #include <iostream>
+#include <cstdlib>
 
 using namespace std;
 
--- avida-2.12.3-src.orig/avida-core/source/tools/tArray.h	2012-02-02 22:50:29.000000000 +0600
+++ avida-2.12.3-src/avida-core/source/tools/tArray.h	2012-05-08 19:33:04.783042892 +0600
@@ -24,6 +24,7 @@
 #define tArray_h
 
 #include <cassert>
+#include <cstdlib>
 
 #ifndef NULL
 #define NULL 0